CVE-2025-9179: An attacker was able to perform memory corruption in the GMP process which processes encrypted media
Source GCVE Database
Not known to be exploited · CVSS 9.8 Critical · fixed in 142 : patch affected systems as a priority.
Data as of 30 Oct 2026, 01:57 UTC
- Patch
- Available – fixed in 142, 140.2, 128.14 +1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 19 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
AI-suggested
Mozilla has released official patches fixing this vulnerability in Firefox 142, Thunderbird 142, and Firefox ESR versions 115.27, 128.14, and 140.2. Users and administrators should update to these fixed versions to remediate the issue. No additional mitigation steps are required beyond applying these updates.
Description
A critical memory corruption vulnerability exists in the GMP process of Firefox and Thunderbird, which handles encrypted media. This process is sandboxed but has different privileges than the content process. The flaw allows an attacker to perform memory corruption that could lead to sandbox escape and arbitrary code execution. The vulnerability affects Firefox versions prior to 142 and ESR versions prior to 115.27, 128.14, and 140.2, as well as Thunderbird versions prior to 142, 128.14, and 140.2. Mozilla has released fixes in Firefox 142, Thunderbird 142, and the specified ESR versions.
References
- nvd.nist.gov/vuln/detail/CVE-2025-9179 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=1979527 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/08/msg00016.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/08/msg00018.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-64 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-65 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-66 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-67 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-70 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-71 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-72 (opens in a new tab)