What’s Vulnerable › Vulnerabilities

CVE-2020-15681

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-22 · updated 2026-06-17

Description

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

How to fix

Upgrade to a fixed version: Mozilla Firefox 82.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1666568
• https://www.mozilla.org/security/advisories/mfsa2020-45/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1666568
• https://www.mozilla.org/security/advisories/mfsa2020-45/

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