CVE-2021-4129
First published: Tue Dec 07 2021(Updated: )
Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94 and Firefox ESR 91.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Thunderbird | <91.4 | 91.4 |
| Firefox | <95.0 | |
| Firefox ESR | <91.4.0 | |
| Thunderbird | <91.4.0 | |
| Firefox | <95 | 95 |
| Firefox ESR | <91.4 | 91.4 |
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Reference Links
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C1737009%2C1739372%2C1739421
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/
- https://www.mozilla.org/security/advisories/mfsa2021-52/
- https://www.mozilla.org/security/advisories/mfsa2021-53/
- https://www.mozilla.org/security/advisories/mfsa2021-54/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-4129?
CVE-2021-4129 has a medium severity rating due to memory safety issues in affected versions of Mozilla Firefox and Thunderbird.
How do I fix CVE-2021-4129?
To fix CVE-2021-4129, update your Mozilla Firefox or Thunderbird to version 95 or 91.4 respectively.
What versions of software are affected by CVE-2021-4129?
CVE-2021-4129 affects Mozilla Firefox up to version 94, Firefox ESR up to version 91.3, and Thunderbird up to version 91.3.
What are the potential impacts of CVE-2021-4129?
The potential impacts of CVE-2021-4129 include memory corruption that could lead to arbitrary code execution.
Who reported the CVE-2021-4129 vulnerability?
CVE-2021-4129 was reported by Mozilla developers and community members including Julian Hector, Randell Jesup, and others.
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