CVE-2021-4128: Use After Free
First published: Tue Dec 07 2021(Updated: )
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.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Firefox | <95 | 95 |
| Firefox | <95.0 | |
| Apple iOS and macOS |
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Reference Links
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-4128?
CVE-2021-4128 is classified as having a high severity due to potential memory corruption and exploitation risks.
How do I fix CVE-2021-4128?
To fix CVE-2021-4128, update Firefox to version 95 or higher.
Who is affected by CVE-2021-4128?
CVE-2021-4128 affects users running Firefox versions prior to 95 on MacOS.
What type of vulnerability is CVE-2021-4128?
CVE-2021-4128 is a memory corruption vulnerability that occurs during fullscreen transitions.
Is CVE-2021-4128 exploitable?
Yes, CVE-2021-4128 could potentially be exploited to cause crashes on affected systems.
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