Memory Safety Vulnerabilities in Firefox and Thunderbird by Mozilla
CVE-2025-1020

9.8CRITICAL

Key Information:

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

Summary

Memory safety vulnerabilities in Firefox and Thunderbird versions prior to 135 have been identified, showcasing evidence of potential memory corruption issues. These vulnerabilities may allow for arbitrary code execution if successfully exploited. Users are strongly urged to upgrade to the latest versions to mitigate risks and ensure enhanced security.

Affected Version(s)

Firefox < 135

Thunderbird < 135

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2...
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-11/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

The Mozilla Fuzzing Team
.