CVE-2023-25752: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

When accessing throttled streams, the count of available bytes needed to be checked in the calling function to be within bounds. This may have lead future code to be incorrect and vulnerable. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

Affected products

• Mozilla Firefox: before 111.0 (fixed in 111.0)
• Mozilla Firefox ESR: before 102.9 (fixed in 102.9)
• Mozilla Thunderbird: before 102.9 (fixed in 102.9)

Published 2023-06-02. Last modified 2026-06-17.