Memory Safety Vulnerabilities in Firefox and Thunderbird by Mozilla
CVE-2025-8034

8.8HIGH

Key Information:

Vendor

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

What is CVE-2025-8034?

Memory safety bugs have been identified in several versions of Firefox and Thunderbird, which exhibit signs of memory corruption. If exploited, these vulnerabilities could potentially allow unauthorized execution of arbitrary code. It is crucial for users to upgrade to the latest versions to mitigate risks associated with these vulnerabilities. Affected versions include Firefox < 141, various ESR versions prior to their respective updates, and Thunderbird < 141. Immediate action is advised to ensure security and protect sensitive information.

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Affected Version(s)

Firefox < 141

Firefox ESR < 115.26

Firefox ESR < 128.13

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1970422
https://www.mozilla.org/security/advisories/mfsa2025-56/
https://www.mozilla.org/security/advisories/mfsa2025-57/

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
JSON
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