Use-After-Free Vulnerability in Mozilla Firefox and Thunderbird
CVE-2025-1010

8.8HIGH

Key Information:

Vendor
Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
4 February 2025

Summary

A vulnerability exists in the Custom Highlight API of Firefox and Thunderbird that allows an attacker to exploit a use-after-free condition. This flaw may result in a crash, potentially leading to further exploitation. Affected versions include specific releases of Firefox and Thunderbird prior to indicated versions. Users are urged to update their applications to mitigate the risks associated with this vulnerability.

Affected Version(s)

Firefox < 135

Firefox ESR < 115.20

Firefox ESR < 128.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1936982
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-08/

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

Atte Kettunen
.