Vulnerability Description
Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 85.0 |
| Mozilla | Firefox Esr | < 78.7 |
| Mozilla | Thunderbird | < 78.7 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675755Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675755Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/Release NotesVendor Advisory
FAQ
What is CVE-2021-23960?
CVE-2021-23960 is a vulnerability with a CVSS score of 8.8 (HIGH). Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and...
How severe is CVE-2021-23960?
CVE-2021-23960 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-23960?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.