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VulnerabilityPublished Updated

CVE-2025-9179: An attacker was able to perform memory corruption in the GMP process which processes encrypted media

Source GCVE Database

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Authoritative record:CVE-2025-9179· Critical 9.8

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

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

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