CVE-2025-1011: 
NixOS vulnerability analysis and mitigation

CVE-2025-1011 is a security vulnerability discovered in Mozilla's WebAssembly code generation that affects Firefox < 135, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135. The vulnerability was disclosed on February 4, 2025, and was reported by security researcher Nan Wang (Mozilla Advisory).

The vulnerability stems from a bug in WebAssembly code generation that could lead to a crash. The National Vulnerability Database assigned it a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, while CISA-ADP rated it at 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability could potentially allow an attacker to achieve code execution through a crash in the WebAssembly code generation process. In Thunderbird, while the vulnerability is inherited from the Firefox codebase, it is generally not exploitable through email as scripting is disabled when reading mail. However, it may pose a risk in other features that display remote web content (Mozilla Advisory).

Mozilla has addressed this vulnerability in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135. Users are advised to update to these versions or later to mitigate the risk (Mozilla Advisory, Mozilla Advisory).