CVE-2024-1556: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

The incorrect object was checked for NULL in the built-in profiler, potentially leading to invalid memory access and undefined behavior. *Note:* This issue only affects the application when the profiler is running. 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.