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 ESR < 115.16.1, Thunderbird < 131.0.1, Thunderbird < 128.3.1, and Thunderbird < 115.16.0.
What happened
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.
CISA lists it as exploited, added 15 Oct 2024.
Does it affect you
Names Mozilla Firefox. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Apply the vendor patch named in this advisory.
msrc.microsoft.com - Follow the vendor advisory for the fixed release and any interim mitigation.
mozilla.org - Follow the vendor advisory for the fixed release and any interim mitigation.
mozilla.org - Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- firefox
- Mozilla Firefox: everything below 115.16.1
The record
- NVD status
- Analyzed
- Published
- 09 Oct 2024, last modified 04 Aug 2026 (NVD)
- Severity
- CVSS 3.1 base score 9.8, Critical — computed here from the vector; NVD states 9.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-416 Use After Free (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 15 Oct 2024; federal remediation due 05 Nov 2024. CISA records known use in ransomware campaigns. CISA entry
- Exploit probability
- EPSS 23.2%, 98th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Mozilla · Firefox (CISA)
References on the NVD record
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49039Not ApplicablePatchVendor Advisory
- mozilla.org/security/advisories/mfsa2024-51/Vendor Advisory
- mozilla.org/security/advisories/mfsa2024-52/Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-9680US Government Resource
- bugzilla.mozilla.org/show_bug.cgi?id=1923344Issue TrackingPermissions Required
- bugs.freebsd.org/bugzilla/show_bug.cgi?id=281992Issue Tracking
- lists.debian.org/debian-lts-announce/2024/10/msg00005.htmlMailing List
- lists.debian.org/debian-lts-announce/2024/10/msg00006.htmlMailing List
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.