Use-After-Free Vulnerability in Firefox and Firefox ESR
CVE-2025-13014

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
11 November 2025

What is CVE-2025-13014?

A use-after-free vulnerability has been identified within the Audio/Video component of Firefox, impacting various versions of the browser. This flaw can lead to potential exploitation, whereby an attacker could manipulate freed memory, resulting in unpredictable behavior. Specifically, Firefox versions prior to 145, along with Firefox ESR versions below 140.5 and 115.30, are at risk. Users are encouraged to promptly update their browsers to mitigate any potential risks associated with this vulnerability.

Affected Version(s)

Firefox < 145

Firefox ESR < 140.5

Firefox ESR < 115.30

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1994241
https://www.mozilla.org/security/advisories/mfsa2025-87/
https://www.mozilla.org/security/advisories/mfsa2025-88/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andrew Osmond
JSON
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CVE-2025-13014 : Use-After-Free Vulnerability in Firefox and Firefox ESR