CVE-2021-4128

MEDIUM

Firefox < 95.0 - Use-After-Free in Fullscreen Mode Transition

Title source: llm
STIX 2.1

Description

When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.<br>*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.

References (2)

Core 2
Core References
Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1735852

Scores

CVSS v3 6.5
EPSS 0.0023
EPSS Percentile 46.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (1)
mozilla/firefox < 95.0
Published Dec 22, 2022
Tracked Since Feb 18, 2026