Mozilla Firefox ESR (kn) 140.3.0
Mozilla Firefox ESR (kn) 140.3.0, released September 16, 2025, fixes 142 CVEs in Mozilla Firefox ESR (kn). One of them is being exploited (CVE-2024-9680); 1 on CISA KEV. Patch Radar priority: Patch now. The latest Mozilla Firefox ESR (kn) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox ESR (kn) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 142 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox ESR (kn) | 140.3.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Patch now | CVE-2024-9680 | Mozilla Firefox Use-After-Free Vulnerability | 9.8 | 0.2318 | KEVRansomwareExploited |
| Urgent | CVE-2025-2857 | Incorrect handle could lead to sandbox escapes | 10.0 | 0.0198 | None reported |
| Urgent | CVE-2024-11704 | Mozilla Firefox ESR and 8 others: Double Free | 9.8 | 0.0091 | None reported |
| Urgent | CVE-2024-11693 | Mozilla Firefox ESR and 8 others: The executable file warning was not presented when downloading .library-ms files. | 9.8 | 0.0083 | None reported |
| Urgent | CVE-2025-49710 | Integer overflow in OrderedHashTable | 9.8 | 0.0075 | None reported |
| Urgent | CVE-2025-49709 | Memory corruption in canvas surfaces | 9.8 | 0.0067 | None reported |
| Urgent | CVE-2024-10004 | Mozilla Firefox ESR and 4 others: Improper Restriction of Rendered UI Layers or Frames | 9.1 | 0.0038 | None reported |
| Urgent | CVE-2025-1941 | Lock screen setting bypass in Firefox Focus for Android | 9.1 | 0.0037 | None reported |
| High | CVE-2025-0242 | Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 | 8.8 | 0.1472 | None reported |
| High | CVE-2025-0247 | Memory safety bugs fixed in Firefox 134 and Thunderbird 134 | 9.8 | 0.1070 | None reported |
| High | CVE-2025-4918 | Out-of-bounds access when resolving Promise objects | 9.8 | 0.0952 | None reported |
| High | CVE-2025-4919 | Out-of-bounds access when optimizing linear sums | 8.8 | 0.0912 | None reported |
| High | CVE-2025-6424 | Use-after-free in FontFaceSet | 9.8 | 0.0790 | None reported |
| High | CVE-2024-8381 | Mozilla Firefox ESR and 6 others: Access of Resource Using Incompatible Type ('Type Confusion') | 9.8 | 0.0440 | None reported |
| High | CVE-2025-6436 | Memory safety bugs fixed in Firefox 140 and Thunderbird 140 | 8.1 | 0.0426 | None reported |
| High | CVE-2025-1009 | Use-after-free in XSLT | 9.8 | 0.0120 | None reported |
| High | CVE-2025-3028 | Use-after-free triggered by XSLTProcessor | 8.8 | 0.0087 | None reported |
| High | CVE-2024-10466 | Mozilla Firefox ESR and 7 others: Uncontrolled Resource Consumption | 7.5 | 0.0081 | None reported |
| High | CVE-2024-11697 | Mozilla Firefox ESR and 8 others: Improper Control of Generation of Code ('Code Injection') | 8.8 | 0.0081 | None reported |
| High | CVE-2024-9401 | Mozilla Firefox ESR and 7 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0074 | None reported |
| High | CVE-2025-0241 | Memory corruption when using JavaScript Text Segmentation | 7.7 | 0.0073 | None reported |
| High | CVE-2024-11699 | Mozilla Firefox ESR and 8 others: Improper Control of Generation of Code ('Code Injection') | 8.8 | 0.0072 | None reported |
| High | CVE-2024-8384 | Mozilla Firefox ESR and 6 others: Use After Free | 9.8 | 0.0072 | None reported |
| High | CVE-2025-2817 | Privilege escalation in Thunderbird Updater | 8.8 | 0.0067 | None reported |
| High | CVE-2024-11705 | Mozilla Firefox ESR and 8 others: NULL Pointer Dereference | 9.1 | 0.0066 | None reported |
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