CVE-2024-1557: Mozilla Firefox

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Memory safety bugs present in Firefox 122. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 123.

Affected products

• Mozilla Firefox: before 123.0 (fixed in 123.0)

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