---
title: "CVE-2024-9680: Mozilla Firefox Use-After-Free Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-9680/
description: "CVE-2024-9680 (Mozilla Firefox): Exploited in the wild (CISA KEV). An attacker was able to achieve code execution in the content process by exploiting a…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-10-09
date_modified: 2026-08-04
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-9680"
kev: true
cvss: 9.8
epss: 0.23184
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-9680: Mozilla Firefox Use-After-Free Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Mozilla Firefox. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-10-15, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-11-05 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 23.2% , percentile 98: FIRST’s model estimates a 23.2% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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

## Affected products (CVE record)

- Mozilla Firefox: unspecified < 131.0.2
- Mozilla Firefox ESR: unspecified < 128.3.1
- Mozilla Firefox ESR: unspecified < 115.16.1
- Mozilla Thunderbird: unspecified < 131.0.1
- Mozilla Thunderbird: unspecified < 128.3.1
- Mozilla Thunderbird: unspecified < 115.16.0

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-10-15; federal due date 2024-11-05. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 23.18% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (mozilla.org)](https://www.mozilla.org/en-US/security/advisories/mfsa2024-51/)
- [CVE.org record CVE-2024-9680](https://www.cve.org/CVERecord?id=CVE-2024-9680)
- [NVD entry CVE-2024-9680](https://nvd.nist.gov/vuln/detail/CVE-2024-9680)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-9680)
- [bugzilla.mozilla.org](https://bugzilla.mozilla.org/show_bug.cgi?id=1923344)
- [Windows sandbox escape detected with the in-the-wild exploit](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49039)
- [mozilla.org](https://www.mozilla.org/security/advisories/mfsa2024-51/)
- [mozilla.org](https://www.mozilla.org/security/advisories/mfsa2024-52/)
- [bugs.freebsd.org](https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281992)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2024/10/msg00005.html)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2024/10/msg00006.html)

---
Source page: https://erroneo.us/security/cve/CVE-2024-9680/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt