CVE-2020-15681: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.

Affected products

• Mozilla Firefox: before 82.0 (fixed in 82.0)

Published 2020-10-22. Last modified 2026-06-17.