CVE-2025-5270
SNI was sometimes unencrypted
CVE-2025-5270 is fixed in 310 products on 2 platforms, first by Firefox Developer Edition (ach) 139.0, released May 18, 2025. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
7.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0029
21st percentile
In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability was fixed in Firefox 139 and Thunderbird 139.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Firefox Developer Edition (ach) | 139.0 | Firefox Developer Edition (ach) 139.0 | May 18, 2025 |
| Firefox Developer Edition (af) | 139.0 | Firefox Developer Edition (af) 139.0 | May 18, 2025 |
| Firefox Developer Edition (an) | 139.0 | Firefox Developer Edition (an) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ar) | 139.0 | Firefox Developer Edition (ar) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ast) | 139.0 | Firefox Developer Edition (ast) 139.0 | May 18, 2025 |
| Firefox Developer Edition (az) | 139.0 | Firefox Developer Edition (az) 139.0 | May 18, 2025 |
| Firefox Developer Edition (be) | 139.0 | Firefox Developer Edition (be) 139.0 | May 18, 2025 |
| Firefox Developer Edition (bg) | 139.0 | Firefox Developer Edition (bg) 139.0 | May 18, 2025 |
| Firefox Developer Edition (bn) | 139.0 | Firefox Developer Edition (bn) 139.0 | May 18, 2025 |
| Firefox Developer Edition (br) | 139.0 | Firefox Developer Edition (br) 139.0 | May 18, 2025 |
| Firefox Developer Edition (bs) | 139.0 | Firefox Developer Edition (bs) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ca) | 139.0 | Firefox Developer Edition (ca) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ca-valencia) | 139.0 | Firefox Developer Edition (ca-valencia) 139.0 | May 18, 2025 |
| Firefox Developer Edition (cak) | 139.0 | Firefox Developer Edition (cak) 139.0 | May 18, 2025 |
| Firefox Developer Edition (cs) | 139.0 | Firefox Developer Edition (cs) 139.0 | May 18, 2025 |
| Firefox Developer Edition (cy) | 139.0 | Firefox Developer Edition (cy) 139.0 | May 18, 2025 |
| Firefox Developer Edition (da) | 139.0 | Firefox Developer Edition (da) 139.0 | May 18, 2025 |
| Firefox Developer Edition (de) | 139.0 | Firefox Developer Edition (de) 139.0 | May 18, 2025 |
| Firefox Developer Edition (dsb) | 139.0 | Firefox Developer Edition (dsb) 139.0 | May 18, 2025 |
| Firefox Developer Edition (el) | 139.0 | Firefox Developer Edition (el) 139.0 | May 18, 2025 |
| Firefox Developer Edition (en-CA) | 139.0 | Firefox Developer Edition (en-CA) 139.0 | May 18, 2025 |
| Firefox Developer Edition (en-GB) | 139.0 | Firefox Developer Edition (en-GB) 139.0 | May 18, 2025 |
| Firefox Developer Edition (en-US) | 139.0 | Firefox Developer Edition (en-US) 139.0 | May 18, 2025 |
| Firefox Developer Edition (eo) | 139.0 | Firefox Developer Edition (eo) 139.0 | May 18, 2025 |
| Firefox Developer Edition (es-AR) | 139.0 | Firefox Developer Edition (es-AR) 139.0 | May 18, 2025 |
| Firefox Developer Edition (es-CL) | 139.0 | Firefox Developer Edition (es-CL) 139.0 | May 18, 2025 |
| Firefox Developer Edition (es-ES) | 139.0 | Firefox Developer Edition (es-ES) 139.0 | May 18, 2025 |
| Firefox Developer Edition (es-MX) | 139.0 | Firefox Developer Edition (es-MX) 139.0 | May 18, 2025 |
| Firefox Developer Edition (et) | 139.0 | Firefox Developer Edition (et) 139.0 | May 18, 2025 |
| Firefox Developer Edition (eu) | 139.0 | Firefox Developer Edition (eu) 139.0 | May 18, 2025 |
| Firefox Developer Edition (fa) | 139.0 | Firefox Developer Edition (fa) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ff) | 139.0 | Firefox Developer Edition (ff) 139.0 | May 18, 2025 |
| Firefox Developer Edition (fi) | 139.0 | Firefox Developer Edition (fi) 139.0 | May 18, 2025 |
| Firefox Developer Edition (fr) | 139.0 | Firefox Developer Edition (fr) 139.0 | May 18, 2025 |
| Firefox Developer Edition (fur) | 139.0 | Firefox Developer Edition (fur) 139.0 | May 18, 2025 |
| Firefox Developer Edition (fy-NL) | 139.0 | Firefox Developer Edition (fy-NL) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ga-IE) | 139.0 | Firefox Developer Edition (ga-IE) 139.0 | May 18, 2025 |
| Firefox Developer Edition (gd) | 139.0 | Firefox Developer Edition (gd) 139.0 | May 18, 2025 |
| Firefox Developer Edition (gl) | 139.0 | Firefox Developer Edition (gl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (gn) | 139.0 | Firefox Developer Edition (gn) 139.0 | May 18, 2025 |
| Firefox Developer Edition (gu-IN) | 139.0 | Firefox Developer Edition (gu-IN) 139.0 | May 18, 2025 |
| Firefox Developer Edition (he) | 139.0 | Firefox Developer Edition (he) 139.0 | May 18, 2025 |
| Firefox Developer Edition (hi-IN) | 139.0 | Firefox Developer Edition (hi-IN) 139.0 | May 18, 2025 |
| Firefox Developer Edition (hr) | 139.0 | Firefox Developer Edition (hr) 139.0 | May 18, 2025 |
| Firefox Developer Edition (hsb) | 139.0 | Firefox Developer Edition (hsb) 139.0 | May 18, 2025 |
| Firefox Developer Edition (hu) | 139.0 | Firefox Developer Edition (hu) 139.0 | May 18, 2025 |
| Firefox Developer Edition (hy-AM) | 139.0 | Firefox Developer Edition (hy-AM) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ia) | 139.0 | Firefox Developer Edition (ia) 139.0 | May 18, 2025 |
| Firefox Developer Edition (id) | 139.0 | Firefox Developer Edition (id) 139.0 | May 18, 2025 |
| Firefox Developer Edition (is) | 139.0 | Firefox Developer Edition (is) 139.0 | May 18, 2025 |
| Firefox Developer Edition (it) | 139.0 | Firefox Developer Edition (it) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ja) | 139.0 | Firefox Developer Edition (ja) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ka) | 139.0 | Firefox Developer Edition (ka) 139.0 | May 18, 2025 |
| Firefox Developer Edition (kab) | 139.0 | Firefox Developer Edition (kab) 139.0 | May 18, 2025 |
| Firefox Developer Edition (kk) | 139.0 | Firefox Developer Edition (kk) 139.0 | May 18, 2025 |
| Firefox Developer Edition (km) | 139.0 | Firefox Developer Edition (km) 139.0 | May 18, 2025 |
| Firefox Developer Edition (kn) | 139.0 | Firefox Developer Edition (kn) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ko) | 139.0 | Firefox Developer Edition (ko) 139.0 | May 18, 2025 |
| Firefox Developer Edition (lij) | 139.0 | Firefox Developer Edition (lij) 139.0 | May 18, 2025 |
| Firefox Developer Edition (lt) | 139.0 | Firefox Developer Edition (lt) 139.0 | May 18, 2025 |
| Firefox Developer Edition (lv) | 139.0 | Firefox Developer Edition (lv) 139.0 | May 18, 2025 |
| Firefox Developer Edition (mk) | 139.0 | Firefox Developer Edition (mk) 139.0 | May 18, 2025 |
| Firefox Developer Edition (mr) | 139.0 | Firefox Developer Edition (mr) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ms) | 139.0 | Firefox Developer Edition (ms) 139.0 | May 18, 2025 |
| Firefox Developer Edition (my) | 139.0 | Firefox Developer Edition (my) 139.0 | May 18, 2025 |
| Firefox Developer Edition (nb-NO) | 139.0 | Firefox Developer Edition (nb-NO) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ne-NP) | 139.0 | Firefox Developer Edition (ne-NP) 139.0 | May 18, 2025 |
| Firefox Developer Edition (nl) | 139.0 | Firefox Developer Edition (nl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (nn-NO) | 139.0 | Firefox Developer Edition (nn-NO) 139.0 | May 18, 2025 |
| Firefox Developer Edition (oc) | 139.0 | Firefox Developer Edition (oc) 139.0 | May 18, 2025 |
| Firefox Developer Edition (pa-IN) | 139.0 | Firefox Developer Edition (pa-IN) 139.0 | May 18, 2025 |
| Firefox Developer Edition (pl) | 139.0 | Firefox Developer Edition (pl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (pt-BR) | 139.0 | Firefox Developer Edition (pt-BR) 139.0 | May 18, 2025 |
| Firefox Developer Edition (pt-PT) | 139.0 | Firefox Developer Edition (pt-PT) 139.0 | May 18, 2025 |
| Firefox Developer Edition (rm) | 139.0 | Firefox Developer Edition (rm) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ro) | 139.0 | Firefox Developer Edition (ro) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ru) | 139.0 | Firefox Developer Edition (ru) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sc) | 139.0 | Firefox Developer Edition (sc) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sco) | 139.0 | Firefox Developer Edition (sco) 139.0 | May 18, 2025 |
| Firefox Developer Edition (si) | 139.0 | Firefox Developer Edition (si) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sk) | 139.0 | Firefox Developer Edition (sk) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sl) | 139.0 | Firefox Developer Edition (sl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (son) | 139.0 | Firefox Developer Edition (son) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sq) | 139.0 | Firefox Developer Edition (sq) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sr) | 139.0 | Firefox Developer Edition (sr) 139.0 | May 18, 2025 |
| Firefox Developer Edition (sv-SE) | 139.0 | Firefox Developer Edition (sv-SE) 139.0 | May 18, 2025 |
| Firefox Developer Edition (szl) | 139.0 | Firefox Developer Edition (szl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ta) | 139.0 | Firefox Developer Edition (ta) 139.0 | May 18, 2025 |
| Firefox Developer Edition (te) | 139.0 | Firefox Developer Edition (te) 139.0 | May 18, 2025 |
| Firefox Developer Edition (tg) | 139.0 | Firefox Developer Edition (tg) 139.0 | May 18, 2025 |
| Firefox Developer Edition (th) | 139.0 | Firefox Developer Edition (th) 139.0 | May 18, 2025 |
| Firefox Developer Edition (tl) | 139.0 | Firefox Developer Edition (tl) 139.0 | May 18, 2025 |
| Firefox Developer Edition (tr) | 139.0 | Firefox Developer Edition (tr) 139.0 | May 18, 2025 |
| Firefox Developer Edition (trs) | 139.0 | Firefox Developer Edition (trs) 139.0 | May 18, 2025 |
| Firefox Developer Edition (uk) | 139.0 | Firefox Developer Edition (uk) 139.0 | May 18, 2025 |
| Firefox Developer Edition (ur) | 139.0 | Firefox Developer Edition (ur) 139.0 | May 18, 2025 |
| Firefox Developer Edition (uz) | 139.0 | Firefox Developer Edition (uz) 139.0 | May 18, 2025 |
| Firefox Developer Edition (vi) | 139.0 | Firefox Developer Edition (vi) 139.0 | May 18, 2025 |
| Firefox Developer Edition (xh) | 139.0 | Firefox Developer Edition (xh) 139.0 | May 18, 2025 |
| Firefox Developer Edition (zh-CN) | 139.0 | Firefox Developer Edition (zh-CN) 139.0 | May 18, 2025 |
| Firefox Developer Edition (zh-TW) | 139.0 | Firefox Developer Edition (zh-TW) 139.0 | May 18, 2025 |
| Mozilla Firefox (ach) | 139.0 | Mozilla Firefox (ach) 139.0 | May 27, 2025 |
| Mozilla Firefox (af) | 139.0 | Mozilla Firefox (af) 139.0 | May 27, 2025 |
| Mozilla Firefox (an) | 139.0 | Mozilla Firefox (an) 139.0 | May 27, 2025 |
| Mozilla Firefox (ar) | 139.0 | Mozilla Firefox (ar) 139.0 | May 27, 2025 |
| Mozilla Firefox (ast) | 139.0 | Mozilla Firefox (ast) 139.0 | May 27, 2025 |
| Mozilla Firefox (az) | 139.0 | Mozilla Firefox (az) 139.0 | May 27, 2025 |
| Mozilla Firefox (be) | 139.0 | Mozilla Firefox (be) 139.0 | May 27, 2025 |
| Mozilla Firefox (bg) | 139.0 | Mozilla Firefox (bg) 139.0 | May 27, 2025 |
| Mozilla Firefox (bn) | 139.0 | Mozilla Firefox (bn) 139.0 | May 27, 2025 |
| Mozilla Firefox (br) | 139.0 | Mozilla Firefox (br) 139.0 | May 27, 2025 |
| Mozilla Firefox (bs) | 139.0 | Mozilla Firefox (bs) 139.0 | May 27, 2025 |
| Mozilla Firefox (ca) | 139.0 | Mozilla Firefox (ca) 139.0 | May 27, 2025 |
| Mozilla Firefox (ca-valencia) | 139.0 | Mozilla Firefox (ca-valencia) 139.0 | May 27, 2025 |
| Mozilla Firefox (cak) | 139.0 | Mozilla Firefox (cak) 139.0 | May 27, 2025 |
| Mozilla Firefox (cs) | 139.0 | Mozilla Firefox (cs) 139.0 | May 27, 2025 |
| Mozilla Firefox (cy) | 139.0 | Mozilla Firefox (cy) 139.0 | May 27, 2025 |
| Mozilla Firefox (da) | 139.0 | Mozilla Firefox (da) 139.0 | May 27, 2025 |
| Mozilla Firefox (de) | 139.0 | Mozilla Firefox (de) 139.0 | May 27, 2025 |
| Mozilla Firefox (dsb) | 139.0 | Mozilla Firefox (dsb) 139.0 | May 27, 2025 |
| Mozilla Firefox (el) | 139.0 | Mozilla Firefox (el) 139.0 | May 27, 2025 |
| Mozilla Firefox (en-CA) | 139.0 | Mozilla Firefox (en-CA) 139.0 | May 27, 2025 |
| Mozilla Firefox (en-GB) | 139.0 | Mozilla Firefox (en-GB) 139.0 | May 27, 2025 |
| Mozilla Firefox (en-US) | 139.0 | Mozilla Firefox (en-US) 139.0 | May 27, 2025 |
| Mozilla Firefox (eo) | 139.0 | Mozilla Firefox (eo) 139.0 | May 27, 2025 |
| Mozilla Firefox (es-AR) | 139.0 | Mozilla Firefox (es-AR) 139.0 | May 27, 2025 |
| Mozilla Firefox (es-CL) | 139.0 | Mozilla Firefox (es-CL) 139.0 | May 27, 2025 |
| Mozilla Firefox (es-ES) | 139.0 | Mozilla Firefox (es-ES) 139.0 | May 27, 2025 |
| Mozilla Firefox (es-MX) | 139.0 | Mozilla Firefox (es-MX) 139.0 | May 27, 2025 |
| Mozilla Firefox (et) | 139.0 | Mozilla Firefox (et) 139.0 | May 27, 2025 |
| Mozilla Firefox (eu) | 139.0 | Mozilla Firefox (eu) 139.0 | May 27, 2025 |
| Mozilla Firefox (fa) | 139.0 | Mozilla Firefox (fa) 139.0 | May 27, 2025 |
| Mozilla Firefox (ff) | 139.0 | Mozilla Firefox (ff) 139.0 | May 27, 2025 |
| Mozilla Firefox (fi) | 139.0 | Mozilla Firefox (fi) 139.0 | May 27, 2025 |
| Mozilla Firefox (fr) | 139.0 | Mozilla Firefox (fr) 139.0 | May 27, 2025 |
| Mozilla Firefox (fur) | 139.0 | Mozilla Firefox (fur) 139.0 | May 27, 2025 |
| Mozilla Firefox (fy-NL) | 139.0 | Mozilla Firefox (fy-NL) 139.0 | May 27, 2025 |
| Mozilla Firefox (ga-IE) | 139.0 | Mozilla Firefox (ga-IE) 139.0 | May 27, 2025 |
| Mozilla Firefox (gd) | 139.0 | Mozilla Firefox (gd) 139.0 | May 27, 2025 |
| Mozilla Firefox (gl) | 139.0 | Mozilla Firefox (gl) 139.0 | May 27, 2025 |
| Mozilla Firefox (gn) | 139.0 | Mozilla Firefox (gn) 139.0 | May 27, 2025 |
| Mozilla Firefox (gu-IN) | 139.0 | Mozilla Firefox (gu-IN) 139.0 | May 27, 2025 |
| Mozilla Firefox (he) | 139.0 | Mozilla Firefox (he) 139.0 | May 27, 2025 |
| Mozilla Firefox (hi-IN) | 139.0 | Mozilla Firefox (hi-IN) 139.0 | May 27, 2025 |
| Mozilla Firefox (hr) | 139.0 | Mozilla Firefox (hr) 139.0 | May 27, 2025 |
| Mozilla Firefox (hsb) | 139.0 | Mozilla Firefox (hsb) 139.0 | May 27, 2025 |
| Mozilla Firefox (hu) | 139.0 | Mozilla Firefox (hu) 139.0 | May 27, 2025 |
| Mozilla Firefox (hy-AM) | 139.0 | Mozilla Firefox (hy-AM) 139.0 | May 27, 2025 |
| Mozilla Firefox (ia) | 139.0 | Mozilla Firefox (ia) 139.0 | May 27, 2025 |
| Mozilla Firefox (id) | 139.0 | Mozilla Firefox (id) 139.0 | May 27, 2025 |
| Mozilla Firefox (is) | 139.0 | Mozilla Firefox (is) 139.0 | May 27, 2025 |
| Mozilla Firefox (it) | 139.0 | Mozilla Firefox (it) 139.0 | May 27, 2025 |
| Mozilla Firefox (ja) | 139.0 | Mozilla Firefox (ja) 139.0 | May 27, 2025 |
| Mozilla Firefox (ka) | 139.0 | Mozilla Firefox (ka) 139.0 | May 27, 2025 |
| Mozilla Firefox (kab) | 139.0 | Mozilla Firefox (kab) 139.0 | May 27, 2025 |
| Mozilla Firefox (kk) | 139.0 | Mozilla Firefox (kk) 139.0 | May 27, 2025 |
| Mozilla Firefox (km) | 139.0 | Mozilla Firefox (km) 139.0 | May 27, 2025 |
| Mozilla Firefox (kn) | 139.0 | Mozilla Firefox (kn) 139.0 | May 27, 2025 |
| Mozilla Firefox (ko) | 139.0 | Mozilla Firefox (ko) 139.0 | May 27, 2025 |
| Mozilla Firefox (lij) | 139.0 | Mozilla Firefox (lij) 139.0 | May 27, 2025 |
| Mozilla Firefox (lt) | 139.0 | Mozilla Firefox (lt) 139.0 | May 27, 2025 |
| Mozilla Firefox (lv) | 139.0 | Mozilla Firefox (lv) 139.0 | May 27, 2025 |
| Mozilla Firefox (mk) | 139.0 | Mozilla Firefox (mk) 139.0 | May 27, 2025 |
| Mozilla Firefox (mr) | 139.0 | Mozilla Firefox (mr) 139.0 | May 27, 2025 |
| Mozilla Firefox (ms) | 139.0 | Mozilla Firefox (ms) 139.0 | May 27, 2025 |
| Mozilla Firefox (my) | 139.0 | Mozilla Firefox (my) 139.0 | May 27, 2025 |
| Mozilla Firefox (nb-NO) | 139.0 | Mozilla Firefox (nb-NO) 139.0 | May 27, 2025 |
| Mozilla Firefox (ne-NP) | 139.0 | Mozilla Firefox (ne-NP) 139.0 | May 27, 2025 |
| Mozilla Firefox (nl) | 139.0 | Mozilla Firefox (nl) 139.0 | May 27, 2025 |
| Mozilla Firefox (nn-NO) | 139.0 | Mozilla Firefox (nn-NO) 139.0 | May 27, 2025 |
| Mozilla Firefox (oc) | 139.0 | Mozilla Firefox (oc) 139.0 | May 27, 2025 |
| Mozilla Firefox (pa-IN) | 139.0 | Mozilla Firefox (pa-IN) 139.0 | May 27, 2025 |
| Mozilla Firefox (pl) | 139.0 | Mozilla Firefox (pl) 139.0 | May 27, 2025 |
| Mozilla Firefox (pt-BR) | 139.0 | Mozilla Firefox (pt-BR) 139.0 | May 27, 2025 |
| Mozilla Firefox (pt-PT) | 139.0 | Mozilla Firefox (pt-PT) 139.0 | May 27, 2025 |
| Mozilla Firefox (rm) | 139.0 | Mozilla Firefox (rm) 139.0 | May 27, 2025 |
| Mozilla Firefox (ro) | 139.0 | Mozilla Firefox (ro) 139.0 | May 27, 2025 |
| Mozilla Firefox (ru) | 139.0 | Mozilla Firefox (ru) 139.0 | May 27, 2025 |
| Mozilla Firefox (sc) | 139.0 | Mozilla Firefox (sc) 139.0 | May 27, 2025 |
| Mozilla Firefox (sco) | 139.0 | Mozilla Firefox (sco) 139.0 | May 27, 2025 |
| Mozilla Firefox (si) | 139.0 | Mozilla Firefox (si) 139.0 | May 27, 2025 |
| Mozilla Firefox (sk) | 139.0 | Mozilla Firefox (sk) 139.0 | May 27, 2025 |
| Mozilla Firefox (sl) | 139.0 | Mozilla Firefox (sl) 139.0 | May 27, 2025 |
| Mozilla Firefox (son) | 139.0 | Mozilla Firefox (son) 139.0 | May 27, 2025 |
| Mozilla Firefox (sq) | 139.0 | Mozilla Firefox (sq) 139.0 | May 27, 2025 |
| Mozilla Firefox (sr) | 139.0 | Mozilla Firefox (sr) 139.0 | May 27, 2025 |
| Mozilla Firefox (sv-SE) | 139.0 | Mozilla Firefox (sv-SE) 139.0 | May 27, 2025 |
| Mozilla Firefox (szl) | 139.0 | Mozilla Firefox (szl) 139.0 | May 27, 2025 |
| Mozilla Firefox (ta) | 139.0 | Mozilla Firefox (ta) 139.0 | May 27, 2025 |
| Mozilla Firefox (te) | 139.0 | Mozilla Firefox (te) 139.0 | May 27, 2025 |
| Mozilla Firefox (tg) | 139.0 | Mozilla Firefox (tg) 139.0 | May 27, 2025 |
| Mozilla Firefox (th) | 139.0 | Mozilla Firefox (th) 139.0 | May 27, 2025 |
| Mozilla Firefox (tl) | 139.0 | Mozilla Firefox (tl) 139.0 | May 27, 2025 |
| Mozilla Firefox (tr) | 139.0 | Mozilla Firefox (tr) 139.0 | May 27, 2025 |
| Mozilla Firefox (trs) | 139.0 | Mozilla Firefox (trs) 139.0 | May 27, 2025 |
| Mozilla Firefox (uk) | 139.0 | Mozilla Firefox (uk) 139.0 | May 27, 2025 |
| Mozilla Firefox (ur) | 139.0 | Mozilla Firefox (ur) 139.0 | May 27, 2025 |
| Mozilla Firefox (uz) | 139.0 | Mozilla Firefox (uz) 139.0 | May 27, 2025 |
| Mozilla Firefox (vi) | 139.0 | Mozilla Firefox (vi) 139.0 | May 27, 2025 |
| Mozilla Firefox (xh) | 139.0 | Mozilla Firefox (xh) 139.0 | May 27, 2025 |
| Mozilla Firefox (zh-CN) | 139.0 | Mozilla Firefox (zh-CN) 139.0 | May 27, 2025 |
| Mozilla Firefox (zh-TW) | 139.0 | Mozilla Firefox (zh-TW) 139.0 | May 27, 2025 |
| Mozilla Firefox ESR (ach) | 140.3.0 | Mozilla Firefox ESR (ach) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (af) | 140.3.0 | Mozilla Firefox ESR (af) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (an) | 140.3.0 | Mozilla Firefox ESR (an) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ar) | 140.3.0 | Mozilla Firefox ESR (ar) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ast) | 140.3.0 | Mozilla Firefox ESR (ast) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (az) | 140.3.0 | Mozilla Firefox ESR (az) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (be) | 140.3.0 | Mozilla Firefox ESR (be) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bg) | 140.3.0 | Mozilla Firefox ESR (bg) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bn) | 140.3.0 | Mozilla Firefox ESR (bn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (br) | 140.3.0 | Mozilla Firefox ESR (br) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bs) | 140.3.0 | Mozilla Firefox ESR (bs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ca) | 140.3.0 | Mozilla Firefox ESR (ca) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ca-valencia) | 140.3.0 | Mozilla Firefox ESR (ca-valencia) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cak) | 140.3.0 | Mozilla Firefox ESR (cak) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cs) | 140.3.0 | Mozilla Firefox ESR (cs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cy) | 140.3.0 | Mozilla Firefox ESR (cy) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (da) | 140.3.0 | Mozilla Firefox ESR (da) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (de) | 140.3.0 | Mozilla Firefox ESR (de) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (dsb) | 140.3.0 | Mozilla Firefox ESR (dsb) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (el) | 140.3.0 | Mozilla Firefox ESR (el) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-CA) | 140.3.0 | Mozilla Firefox ESR (en-CA) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-GB) | 140.3.0 | Mozilla Firefox ESR (en-GB) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-US) | 140.3.0 | Mozilla Firefox ESR (en-US) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (eo) | 140.3.0 | Mozilla Firefox ESR (eo) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-AR) | 140.3.0 | Mozilla Firefox ESR (es-AR) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-CL) | 140.3.0 | Mozilla Firefox ESR (es-CL) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-ES) | 140.3.0 | Mozilla Firefox ESR (es-ES) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-MX) | 140.3.0 | Mozilla Firefox ESR (es-MX) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (et) | 140.3.0 | Mozilla Firefox ESR (et) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (eu) | 140.3.0 | Mozilla Firefox ESR (eu) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fa) | 140.3.0 | Mozilla Firefox ESR (fa) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ff) | 140.3.0 | Mozilla Firefox ESR (ff) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fi) | 140.3.0 | Mozilla Firefox ESR (fi) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fr) | 140.3.0 | Mozilla Firefox ESR (fr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fur) | 140.3.0 | Mozilla Firefox ESR (fur) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fy-NL) | 140.3.0 | Mozilla Firefox ESR (fy-NL) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ga-IE) | 140.3.0 | Mozilla Firefox ESR (ga-IE) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gd) | 140.3.0 | Mozilla Firefox ESR (gd) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gl) | 140.3.0 | Mozilla Firefox ESR (gl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gn) | 140.3.0 | Mozilla Firefox ESR (gn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gu-IN) | 140.3.0 | Mozilla Firefox ESR (gu-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (he) | 140.3.0 | Mozilla Firefox ESR (he) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hi-IN) | 140.3.0 | Mozilla Firefox ESR (hi-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hr) | 140.3.0 | Mozilla Firefox ESR (hr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hsb) | 140.3.0 | Mozilla Firefox ESR (hsb) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hu) | 140.3.0 | Mozilla Firefox ESR (hu) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hy-AM) | 140.3.0 | Mozilla Firefox ESR (hy-AM) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ia) | 140.3.0 | Mozilla Firefox ESR (ia) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (id) | 140.3.0 | Mozilla Firefox ESR (id) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (is) | 140.3.0 | Mozilla Firefox ESR (is) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (it) | 140.3.0 | Mozilla Firefox ESR (it) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ja) | 140.3.0 | Mozilla Firefox ESR (ja) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ka) | 140.3.0 | Mozilla Firefox ESR (ka) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kab) | 140.3.0 | Mozilla Firefox ESR (kab) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kk) | 140.3.0 | Mozilla Firefox ESR (kk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (km) | 140.3.0 | Mozilla Firefox ESR (km) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kn) | 140.3.0 | Mozilla Firefox ESR (kn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ko) | 140.3.0 | Mozilla Firefox ESR (ko) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lij) | 140.3.0 | Mozilla Firefox ESR (lij) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lt) | 140.3.0 | Mozilla Firefox ESR (lt) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lv) | 140.3.0 | Mozilla Firefox ESR (lv) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (mk) | 140.3.0 | Mozilla Firefox ESR (mk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (mr) | 140.3.0 | Mozilla Firefox ESR (mr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ms) | 140.3.0 | Mozilla Firefox ESR (ms) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (my) | 140.3.0 | Mozilla Firefox ESR (my) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nb-NO) | 140.3.0 | Mozilla Firefox ESR (nb-NO) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ne-NP) | 140.3.0 | Mozilla Firefox ESR (ne-NP) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nl) | 140.3.0 | Mozilla Firefox ESR (nl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nn-NO) | 140.3.0 | Mozilla Firefox ESR (nn-NO) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (oc) | 140.3.0 | Mozilla Firefox ESR (oc) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pa-IN) | 140.3.0 | Mozilla Firefox ESR (pa-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pl) | 140.3.0 | Mozilla Firefox ESR (pl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pt-BR) | 140.3.0 | Mozilla Firefox ESR (pt-BR) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pt-PT) | 140.3.0 | Mozilla Firefox ESR (pt-PT) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (rm) | 140.3.0 | Mozilla Firefox ESR (rm) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ro) | 140.3.0 | Mozilla Firefox ESR (ro) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ru) | 140.3.0 | Mozilla Firefox ESR (ru) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sat) | 140.13.0 | Mozilla Firefox ESR (sat) 140.13.0 | Jul 20, 2026 |
| Mozilla Firefox ESR (sc) | 140.3.0 | Mozilla Firefox ESR (sc) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sco) | 140.3.0 | Mozilla Firefox ESR (sco) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (si) | 140.3.0 | Mozilla Firefox ESR (si) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sk) | 140.3.0 | Mozilla Firefox ESR (sk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sl) | 140.3.0 | Mozilla Firefox ESR (sl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (son) | 140.3.0 | Mozilla Firefox ESR (son) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sq) | 140.3.0 | Mozilla Firefox ESR (sq) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sr) | 140.3.0 | Mozilla Firefox ESR (sr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sv-SE) | 140.3.0 | Mozilla Firefox ESR (sv-SE) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (szl) | 140.3.0 | Mozilla Firefox ESR (szl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ta) | 140.3.0 | Mozilla Firefox ESR (ta) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (te) | 140.3.0 | Mozilla Firefox ESR (te) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tg) | 140.3.0 | Mozilla Firefox ESR (tg) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (th) | 140.3.0 | Mozilla Firefox ESR (th) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tl) | 140.3.0 | Mozilla Firefox ESR (tl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tr) | 140.3.0 | Mozilla Firefox ESR (tr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (trs) | 140.3.0 | Mozilla Firefox ESR (trs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (uk) | 140.3.0 | Mozilla Firefox ESR (uk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ur) | 140.3.0 | Mozilla Firefox ESR (ur) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (uz) | 140.3.0 | Mozilla Firefox ESR (uz) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (vi) | 140.3.0 | Mozilla Firefox ESR (vi) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (xh) | 140.3.0 | Mozilla Firefox ESR (xh) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (zh-CN) | 140.3.0 | Mozilla Firefox ESR (zh-CN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (zh-TW) | 140.3.0 | Mozilla Firefox ESR (zh-TW) 140.3.0 | Sep 16, 2025 |
| Linux | |||
| thunderbird · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird-gnome-support 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird-mozsymbols 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-calendar-timezones 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-gdata-provider 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-lightning 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
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