CVE-2019-9821

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CVSS 3.0

8.1 high

EPSS

<1%p56

Published

Jul 23, 2019 (Jul 23, 2019)

Modified

Jun 17, 2026

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.

Vendors: mozilla
Products: firefox
Weakness: CWE-362, CWE-416
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.9%)

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