CVE-2023-6209

Mozilla Firefox ESR and 5 others: Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in…

CVE-2023-6209 is fixed in 114 products on 2 platforms, first by Mozilla Firefox (en-US) 120.0, released November 21, 2023. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 2 platforms
CVSS
6.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0142
72nd percentile

Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in the path could be used to override the specified host. This could contribute to security problems in web sites. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

Where it's fixed

ProductFixed inFixReleased
Windows apps
Mozilla Firefox (en-US) 120.0 Mozilla Firefox (en-US) 120.0 Nov 21, 2023
Mozilla Firefox ESR (ach) 128.3.0 Mozilla Firefox ESR (ach) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (af) 128.3.0 Mozilla Firefox ESR (af) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (an) 128.3.0 Mozilla Firefox ESR (an) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ar) 128.3.0 Mozilla Firefox ESR (ar) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ast) 128.3.0 Mozilla Firefox ESR (ast) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (az) 128.3.0 Mozilla Firefox ESR (az) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (be) 128.3.0 Mozilla Firefox ESR (be) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bg) 128.3.0 Mozilla Firefox ESR (bg) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bn) 128.3.0 Mozilla Firefox ESR (bn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (br) 128.3.0 Mozilla Firefox ESR (br) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bs) 128.3.0 Mozilla Firefox ESR (bs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ca) 128.3.0 Mozilla Firefox ESR (ca) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ca-valencia) 128.3.0 Mozilla Firefox ESR (ca-valencia) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cak) 128.3.0 Mozilla Firefox ESR (cak) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cs) 128.3.0 Mozilla Firefox ESR (cs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cy) 128.3.0 Mozilla Firefox ESR (cy) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (da) 128.3.0 Mozilla Firefox ESR (da) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (de) 128.3.0 Mozilla Firefox ESR (de) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (dsb) 128.3.0 Mozilla Firefox ESR (dsb) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (el) 128.3.0 Mozilla Firefox ESR (el) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-CA) 128.3.0 Mozilla Firefox ESR (en-CA) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-GB) 128.3.0 Mozilla Firefox ESR (en-GB) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-US) 128.3.0 Mozilla Firefox ESR (en-US) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (eo) 128.3.0 Mozilla Firefox ESR (eo) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-AR) 128.3.0 Mozilla Firefox ESR (es-AR) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-CL) 128.3.0 Mozilla Firefox ESR (es-CL) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-ES) 128.3.0 Mozilla Firefox ESR (es-ES) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-MX) 128.3.0 Mozilla Firefox ESR (es-MX) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (et) 128.3.0 Mozilla Firefox ESR (et) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (eu) 128.3.0 Mozilla Firefox ESR (eu) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fa) 128.3.0 Mozilla Firefox ESR (fa) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ff) 128.3.0 Mozilla Firefox ESR (ff) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fi) 128.3.0 Mozilla Firefox ESR (fi) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fr) 128.3.0 Mozilla Firefox ESR (fr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fur) 128.3.0 Mozilla Firefox ESR (fur) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fy-NL) 128.3.0 Mozilla Firefox ESR (fy-NL) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ga-IE) 128.3.0 Mozilla Firefox ESR (ga-IE) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gd) 128.3.0 Mozilla Firefox ESR (gd) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gl) 128.3.0 Mozilla Firefox ESR (gl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gn) 128.3.0 Mozilla Firefox ESR (gn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gu-IN) 128.3.0 Mozilla Firefox ESR (gu-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (he) 128.3.0 Mozilla Firefox ESR (he) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hi-IN) 128.3.0 Mozilla Firefox ESR (hi-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hr) 128.3.0 Mozilla Firefox ESR (hr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hsb) 128.3.0 Mozilla Firefox ESR (hsb) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hu) 128.3.0 Mozilla Firefox ESR (hu) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hy-AM) 128.3.0 Mozilla Firefox ESR (hy-AM) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ia) 128.3.0 Mozilla Firefox ESR (ia) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (id) 128.3.0 Mozilla Firefox ESR (id) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (is) 128.3.0 Mozilla Firefox ESR (is) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (it) 128.3.0 Mozilla Firefox ESR (it) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ja) 128.3.0 Mozilla Firefox ESR (ja) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ka) 128.3.0 Mozilla Firefox ESR (ka) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kab) 128.3.0 Mozilla Firefox ESR (kab) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kk) 128.3.0 Mozilla Firefox ESR (kk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (km) 128.3.0 Mozilla Firefox ESR (km) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kn) 128.3.0 Mozilla Firefox ESR (kn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ko) 128.3.0 Mozilla Firefox ESR (ko) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lij) 128.3.0 Mozilla Firefox ESR (lij) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lt) 128.3.0 Mozilla Firefox ESR (lt) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lv) 128.3.0 Mozilla Firefox ESR (lv) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (mk) 128.3.0 Mozilla Firefox ESR (mk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (mr) 128.3.0 Mozilla Firefox ESR (mr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ms) 128.3.0 Mozilla Firefox ESR (ms) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (my) 128.3.0 Mozilla Firefox ESR (my) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nb-NO) 128.3.0 Mozilla Firefox ESR (nb-NO) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ne-NP) 128.3.0 Mozilla Firefox ESR (ne-NP) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nl) 128.3.0 Mozilla Firefox ESR (nl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nn-NO) 128.3.0 Mozilla Firefox ESR (nn-NO) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (oc) 128.3.0 Mozilla Firefox ESR (oc) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pa-IN) 128.3.0 Mozilla Firefox ESR (pa-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pl) 128.3.0 Mozilla Firefox ESR (pl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pt-BR) 128.3.0 Mozilla Firefox ESR (pt-BR) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pt-PT) 128.3.0 Mozilla Firefox ESR (pt-PT) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (rm) 128.3.0 Mozilla Firefox ESR (rm) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ro) 128.3.0 Mozilla Firefox ESR (ro) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ru) 128.3.0 Mozilla Firefox ESR (ru) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sc) 128.3.0 Mozilla Firefox ESR (sc) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sco) 128.3.0 Mozilla Firefox ESR (sco) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (si) 128.3.0 Mozilla Firefox ESR (si) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sk) 128.3.0 Mozilla Firefox ESR (sk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sl) 128.3.0 Mozilla Firefox ESR (sl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (son) 128.3.0 Mozilla Firefox ESR (son) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sq) 128.3.0 Mozilla Firefox ESR (sq) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sr) 128.3.0 Mozilla Firefox ESR (sr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sv-SE) 128.3.0 Mozilla Firefox ESR (sv-SE) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (szl) 128.3.0 Mozilla Firefox ESR (szl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ta) 128.3.0 Mozilla Firefox ESR (ta) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (te) 128.3.0 Mozilla Firefox ESR (te) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tg) 128.3.0 Mozilla Firefox ESR (tg) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (th) 128.3.0 Mozilla Firefox ESR (th) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tl) 128.3.0 Mozilla Firefox ESR (tl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tr) 128.3.0 Mozilla Firefox ESR (tr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (trs) 128.3.0 Mozilla Firefox ESR (trs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (uk) 128.3.0 Mozilla Firefox ESR (uk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ur) 128.3.0 Mozilla Firefox ESR (ur) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (uz) 128.3.0 Mozilla Firefox ESR (uz) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (vi) 128.3.0 Mozilla Firefox ESR (vi) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (xh) 128.3.0 Mozilla Firefox ESR (xh) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (zh-CN) 128.3.0 Mozilla Firefox ESR (zh-CN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (zh-TW) 128.3.0 Mozilla Firefox ESR (zh-TW) 128.3.0 Oct 1, 2024
Mozilla Thunderbird (en-US) 115.8.0 Mozilla Thunderbird (en-US) 115.8.0 Feb 21, 2024
Linux
firefox · RHEL 8 0:115.5.0-1.el8_9 RHSA-2023:7508 Nov 27, 2023
firefox · RHEL 9 0:115.5.0-1.el9_3 RHSA-2023:7507 Nov 27, 2023
firefox · Ubuntu 20.04 LTS (focal) 120.0+build2-0ubuntu0.20.04.1 firefox 120.0+build2-0ubuntu0.20.04.1 Nov 21, 2023
firefox · almalinux 8 115.5.0-1.el8_9.alma.1 ALSA-2023:7508 Nov 27, 2023
firefox · almalinux 9 115.5.0-1.el9_3.alma.1 ALSA-2023:7507 Nov 27, 2023
firefox · ol 8 0:115.5.0-1.0.1.el8_9 ELSA-2023-7508 Nov 28, 2023
firefox · ol 9 0:115.5.0-1.0.1.el9_3 ELSA-2023-7507 Nov 28, 2023
firefox-esr · Debian 12.15 (bookworm) 115.5.0esr-1~deb12u1 DEBIAN-CVE-2023-6209 Nov 21, 2023
firefox-esr · Debian 13.5 (trixie) 115.5.0esr-1 DEBIAN-CVE-2023-6209 Nov 21, 2023
firefox-esr · Debian 14 115.5.0esr-1 DEBIAN-CVE-2023-6209 Nov 21, 2023
firefox-geckodriver · Ubuntu 20.04 LTS (focal) 120.0+build2-0ubuntu0.20.04.1 firefox-geckodriver 120.0+build2-0ubuntu0.20.04.1 Nov 21, 2023
firefox-mozsymbols · Ubuntu 20.04 LTS (focal) 120.0+build2-0ubuntu0.20.04.1 firefox-mozsymbols 120.0+build2-0ubuntu0.20.04.1 Nov 21, 2023
firefox-x11 · RHEL 9 0:115.5.0-1.el9_3 RHSA-2023:7507 Nov 27, 2023
firefox-x11 · almalinux 9 115.5.0-1.el9_3.alma.1 ALSA-2023:7507 Nov 27, 2023
firefox-x11 · ol 9 0:115.5.0-1.0.1.el9_3 ELSA-2023-7507 Nov 28, 2023
thunderbird · Debian 12.15 (bookworm) 1:115.5.0-1~deb12u1 DEBIAN-CVE-2023-6209 Nov 21, 2023
thunderbird · Debian 13.5 (trixie) 1:115.5.0-1 DEBIAN-CVE-2023-6209 Nov 21, 2023
thunderbird · Debian 14 1:115.5.0-1 DEBIAN-CVE-2023-6209 Nov 21, 2023
thunderbird · RHEL 8 0:115.5.0-1.el8_9 RHSA-2023:7500 Nov 27, 2023
thunderbird · RHEL 9 0:115.5.0-1.el9_3 RHSA-2023:7501 Nov 27, 2023
thunderbird · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 thunderbird 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
thunderbird · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 thunderbird 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
thunderbird · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 thunderbird 1:115.5.0+build1-0ubuntu1 Nov 21, 2023
thunderbird · almalinux 8 115.5.0-1.el8_9.alma.1 ALSA-2023:7500 Nov 27, 2023
thunderbird · almalinux 9 115.5.0-1.el9_3.alma ALSA-2023:7501 Nov 27, 2023
thunderbird · ol 8 0:115.5.0-1.0.1.el8_9 ELSA-2023-7500 Nov 28, 2023
thunderbird · ol 9 0:115.5.0-1.0.1.el9_3 ELSA-2023-7501 Nov 28, 2023
thunderbird · rocky 8 0:115.5.0-1.el8_9 RLSA-2023:7500 Nov 28, 2023
thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 thunderbird-gnome-support 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 thunderbird-gnome-support 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
thunderbird-gnome-support · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 thunderbird-gnome-support 1:115.5.0+build1-0ubuntu1 Nov 21, 2023
thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 thunderbird-mozsymbols 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 thunderbird-mozsymbols 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
thunderbird-mozsymbols · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 thunderbird-mozsymbols 1:115.5.0+build1-0ubuntu1 Nov 21, 2023
xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 xul-ext-calendar-timezones 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 xul-ext-calendar-timezones 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
xul-ext-calendar-timezones · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 xul-ext-calendar-timezones 1:115.5.0+build1-0ubuntu1 Nov 21, 2023
xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 xul-ext-gdata-provider 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 xul-ext-gdata-provider 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
xul-ext-gdata-provider · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 xul-ext-gdata-provider 1:115.5.0+build1-0ubuntu1 Nov 21, 2023
xul-ext-lightning · Ubuntu 20.04 LTS (focal) 1:115.5.0+build1-0ubuntu0.20.04.1 xul-ext-lightning 1:115.5.0+build1-0ubuntu0.20.04.1 Nov 21, 2023
xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) 1:115.5.0+build1-0ubuntu0.22.04.1 xul-ext-lightning 1:115.5.0+build1-0ubuntu0.22.04.1 Nov 21, 2023
xul-ext-lightning · Ubuntu 24.04.5 LTS (noble) 1:115.5.0+build1-0ubuntu1 xul-ext-lightning 1:115.5.0+build1-0ubuntu1 Nov 21, 2023

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