VULNERABILITY INTELLIGENCE

CVE-2019-9821

CVSS score8.1 HIGH

EPSS probability0.85%

CISA KEVNot currently listed

Published2019-07-23

Last modified2026-06-17

CVSS vectorCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. This vulnerability affects Firefox < 67.

Weakness classification

nvd@nist.gov: CWE-362

Primary references

security@mozilla.org — Permissions Required, Vendor Advisory
security@mozilla.org — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Permissions Required, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory