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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2024-9680

Mozilla Firefox Use-After-Free Vulnerability

Mozilla Firefox

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.

CVSS
9.8
CRITICAL
EPSS
23.2%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
9 Oct 2024
CWE-416

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 15 October 2024. US federal agencies were required to remediate it by 5 November 2024. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 23.2%, which is higher than 97.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2024-9680 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2024-9680.

What does CVE-2024-9680 affect?

CVE-2024-9680 affects Mozilla Firefox. 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.

How severe is CVE-2024-9680?

CVE-2024-9680 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 23.2%, higher than 97.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 5 November 2024.

How should organisations respond to CVE-2024-9680?

Apply the vendor patch for Mozilla Firefox as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.