Mozilla Firefox Esr vulnerabilities

CVE-2023-4050 [HIGH] CWE-787 CVE-2023-4050: In some cases, an untrusted input stream was copied to a stack buffer without checking its size. Thi In some cases, an untrusted input stream was copied to a stack buffer without checking its size. This resulted in a potentially exploitable crash which could have led to a sandbox escape. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

CVE-2024-3863 [CRITICAL] CWE-434 CVE-2024-3863: The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue on The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

CVE-2019-11730 [MEDIUM] CVE-2019-11730: A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in comb

CVE-2019-17017 [HIGH] CWE-843 CVE-2019-17017: Due to a missing case handling object types, a type confusion vulnerability could occur, resulting i Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

CVE-2026-8092 Mozilla Foundation Security Advisory 2026-42: CVE-2026-8092 Mozilla Foundation Security Advisory 2026-42 CVE: CVE-2026-8092 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 115.35.2

CVE-2026-12296 Mozilla Foundation Security Advisory 2026-58: CVE-2026-12296 Mozilla Foundation Security Advisory 2026-58 CVE: CVE-2026-12296 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.12

CVE-2026-12297 Mozilla Foundation Security Advisory 2026-58: CVE-2026-12297 Mozilla Foundation Security Advisory 2026-58 CVE: CVE-2026-12297 Product: Firefox ESR Impact: high Fixed in: Firefox ESR 140.12

CVE-2026-92016 Mozilla Foundation Security Advisory 2026-92: CVE-2026-92016 Mozilla Foundation Security Advisory 2026-92 CVE: CVE-2026-92016 Product: Firefox ESR Impact: moderate Fixed in: Firefox ESR 140.16

CVE-2026-100828 Mozilla Foundation Security Advisory 2026-100: CVE-2026-100828 Mozilla Foundation Security Advisory 2026-100 CVE: CVE-2026-100828 Product: Firefox ESR Impact: low Fixed in: Firefox ESR 153.4

CVE-2021-43537 [HIGH] CWE-704 CVE-2021-43537: An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt me An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CVE-2026-92059 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92059 Mozilla Foundation Security Advisory 2026-93 CVE: CVE-2026-92059 Product: Firefox ESR Impact: low Fixed in: Firefox ESR 153.3

CVE-2017-7798 [HIGH] CWE-94 CVE-2017-7798: The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

CVE-2021-43539 [HIGH] CWE-416 CVE-2021-43539: Failure to correctly record the location of live pointers across wasm instance calls resulted in a G Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CVE-2019-11759 [HIGH] CWE-120 CVE-2019-11759: An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored o An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVE-2023-6858 [HIGH] CWE-787 CVE-2023-6858: Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handli Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVE-2018-18493 [CRITICAL] CWE-119 CVE-2018-18493: A buffer overflow can occur in the Skia library during buffer offset calculations with hardware acce A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of 64-bit. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

CVE-2022-40962 [HIGH] CWE-787 CVE-2022-40962: Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 104 and Firefox ESR 102.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vuln

CVE-2023-6861 [HIGH] CWE-787 CVE-2023-6861: The `nsWindow::PickerOpen(void)` method was susceptible to a heap buffer overflow when running in he The `nsWindow::PickerOpen(void)` method was susceptible to a heap buffer overflow when running in headless mode. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVE-2023-6864 [HIGH] CWE-787 CVE-2023-6864: Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. Some of these b Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVE-2021-23995 [HIGH] CWE-672 CVE-2021-23995: When Responsive Design Mode was enabled, it used references to objects that were previously freed. W When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.