Memory Safety Vulnerabilities in Firefox and Thunderbird by Mozilla
CVE-2025-8035

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
22 July 2025

What is CVE-2025-8035?

The vulnerability affecting Mozilla's Firefox and Thunderbird is associated with memory safety bugs that can potentially lead to memory corruption. These flaws are present in certain versions of Firefox and Thunderbird, specifically in the ESR 128.12 and 140.0 series, which could allow attackers to execute arbitrary code with sufficient effort. Users are strongly advised to update to the latest versions, as Mozilla has addressed these issues in the most recent releases.

Affected Version(s)

Firefox < 141

Firefox ESR < 128.13

Firefox ESR < 140.1

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1975961%2...
https://www.mozilla.org/security/advisories/mfsa2025-56/
https://www.mozilla.org/security/advisories/mfsa2025-58/

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

the Mozilla Fuzzing Team
.
CVE-2025-8035 : Memory Safety Vulnerabilities in Firefox and Thunderbird by Mozilla