CVE-2019-9821

HIGH

Firefox < 67.0 - Use-After-Free via AssertWorkerThread Race Condition

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1539125

Scores

CVSS v3 8.1
EPSS 0.0042
EPSS Percentile 62.3%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-362 CWE-416
Status published
Products (1)
mozilla/firefox < 67.0
Published Jul 23, 2019
Tracked Since Feb 18, 2026