CVE-2021-23995

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-672

Affected software

No affected versions have been published.

Timeline

Published
Jun 24, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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