CVE-2024-1551: Debian Linux

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Set-Cookie response headers were being incorrectly honored in multipart HTTP responses. If an attacker could control the Content-Type response header, as well as control part of the response body, they could inject Set-Cookie response headers that would have been honored by the browser. This vulnerability affects Firefox < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.

Affected products

• Debian Debian Linux: version 10.0 only
• Mozilla Firefox: before 115.8.0 (fixed in 115.8.0); before 123.0 (fixed in 123.0)
• Mozilla Thunderbird: before 115.8.0 (fixed in 115.8.0)

Published 2024-02-20. Last modified 2026-06-17.