CVE-2025-13027: 
NixOS vulnerability analysis and mitigation

CVE-2025-13027 is a high-impact memory safety vulnerability affecting Firefox 144 and Thunderbird 144. The vulnerability was discovered by The Mozilla Fuzzing Team and disclosed on November 11, 2025. The affected systems include Firefox versions prior to 145 and Thunderbird versions prior to 145 (Mozilla Advisory, NVD).

The vulnerability represents multiple memory safety bugs that show evidence of memory corruption. These bugs are classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). The vulnerability has received a CVSS v3.1 base score of 9.8 (CRITICAL) with the 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 attackers to execute arbitrary code on affected systems. With sufficient effort, these memory corruption issues could be exploited to run malicious code, potentially leading to full system compromise depending on the user's privileges (Mozilla Advisory, GBHackers).

Mozilla has released patches in Firefox 145 and Thunderbird 145 to address these vulnerabilities. Users are strongly recommended to update to the latest versions immediately. The updates can be accessed through automatic update mechanisms or by visiting Mozilla's official website (Mozilla Advisory, GBHackers).