CVE-2024-9680 — Mozilla Firefox Use-After-Free Vulnerability

An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild. This vulnerability affects Firefox < 131.0.2, Firefox ESR < 128.3.1, Firefox E

01What is this vulnerability?

An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild. This vulnerability affects Firefox < 131.0.2, Firefox ESR < 128.3.1, Firefox ESR < 115.16.1, Thunderbird < 131.0.1, Thunderbird < 128.3.1, and Thunderbird < 115.16.0.

02Affected products

Vendor	Product	Versions
Mozilla	Firefox	unspecified
Mozilla	Firefox ESR	unspecified
Mozilla	Firefox ESR	unspecified
Mozilla	Thunderbird	unspecified
Mozilla	Thunderbird	unspecified
Mozilla	Thunderbird	unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2024-10-15. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

08Timeline

• Published: 2024-10-09T12:59:07.108Z
• Last modified: 2025-11-03T22:33:32.973Z
• Added to CISA KEV: 2024-10-15
• BOD 22-01 due: 2024-11-05

09References

• bugzilla.mozilla.org — https://bugzilla.mozilla.org/show_bug.cgi?id=1923344
• msrc.microsoft.com — https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49039
• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2024-51/
• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2024-52/