Remote Code Execution Vulnerability in Firefox by Mozilla
CVE-2025-10529

6.5MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
16 September 2025

What is CVE-2025-10529?

A remote code execution vulnerability has been identified in Firefox versions below 143 and Firefox Extended Support Release (ESR) below 140.3. This vulnerability allows attackers to execute arbitrary code on affected installations, which could lead to unauthorized access and manipulation of user systems. It is crucial for Firefox users to update to the latest version to mitigate potential exploitation risks.

Affected Version(s)

Firefox 140.3

Firefox 143

Thunderbird 140.3

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1970490
https://www.mozilla.org/security/advisories/mfsa2025-73/
https://www.mozilla.org/security/advisories/mfsa2025-75/

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Daniel Holbert
.