CVE-2021-23970: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

Context-specific code was included in a shared jump table; resulting in assertions being triggered in multithreaded wasm code. This vulnerability affects Firefox < 86.

Affected products

• Mozilla Firefox: before 86.0 (fixed in 86.0)

Published 2021-02-26. Last modified 2026-06-17.