CVE-2025-9179

Description

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-119 Buffer Overflow

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 115.27.0
mozilla	firefox	< 142.0
mozilla	firefox	128.0 — 128.14.0
mozilla	firefox	140.0 — 140.2.0
mozilla	thunderbird	< 128.14.0
mozilla	thunderbird	< 142.0
mozilla	thunderbird	140.0 — 140.2.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-64/ https://www.mozilla.org/security/advisories/mfsa2025-65/ https://www.mozilla.org/security/advisories/mfsa2025-66/ https://www.mozilla.org/security/advisories/mfsa2025-67/ https://www.mozilla.org/security/advisories/mfsa2025-70/ https://www.mozilla.org/security/advisories/mfsa2025-71/ https://www.mozilla.org/security/advisories/mfsa2025-72/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1979527 https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html

Frequently Asked Questions

What is CVE-2025-9179? +

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-9179? +

CVE-2025-9179 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-9179? +

CVE-2025-9179 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-9179? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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