WebAssembly Code Generation Flaw in Mozilla Firefox and Thunderbird
CVE-2025-1011

8.8HIGH

Key Information:

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

Summary

A flaw in the WebAssembly code generation process affects multiple versions of Mozilla Firefox and Thunderbird. Exploitation of this weakness may allow attackers to execute arbitrary code, potentially leading to crashes or unauthorized actions within the affected applications. Users of Firefox versions prior to 135 and Thunderbird versions prior to 135 or 128.7 are particularly at risk and should take immediate action to update their software to mitigate this vulnerability.

Affected Version(s)

Firefox < 135

Firefox ESR < 128.7

Thunderbird < 128.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1936454
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-09/

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

Nan Wang
.