CVE-2023-5168: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

A compromised content process could have provided malicious data to `FilterNodeD2D1` resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

Affected products

• Mozilla Firefox: before 118 (fixed in 118)
• Mozilla Firefox ESR: before 115.3 (fixed in 115.3)
• Mozilla Thunderbird: before 115.3 (fixed in 115.3)

Published 2023-09-27. Last modified 2026-06-17.