CVE-2020-6819

Mozilla: Use-after-free while running the nsDocShell destructor

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Severity

Critical

Red Hat Product Security

8.8

CVSS 3.1

Review impact separately from score.

Published · April 3, 2020

Updated · November 21, 2025

Description

A flaw was found in Mozilla Firefox. A race condition can occur while running the nsDocShell destructor causing a use-after-free memory issue. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-416 · Use After Free