Vulnerability Description
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. 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. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 95.0 |
| Mozilla | Firefox Esr | < 91.4.0 |
| Mozilla | Thunderbird | < 91.4.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C17ExploitIssue TrackingVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-53/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-54/Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C17ExploitIssue TrackingVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-53/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-54/Vendor Advisory
FAQ
What is CVE-2021-4129?
CVE-2021-4129 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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. Some of th...
How severe is CVE-2021-4129?
CVE-2021-4129 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-4129?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.