CVE-2021-4128

MEDIUM 6.5CVE-2021-4128 · Published 22/12/2022 · updated 17/06/2026

In short

CVE-2021-4128 is a MEDIUM (CVSS 6.5) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.57%, higher than 47.6% of all vulnerabilities.
Fix: update to 95.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 95.0`	`95.0`

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

bugzilla.mozilla.org/show_bug.cgi · Exploit
mozilla.org/security/advisories/mfsa2021-52 · Vendor Advisory

More vulnerabilities in firefox

See all →

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free

Package

Affected versions

Patched versions

firefox

mozilla

< 95.0

95.0

More vulnerabilities in firefox

See all →