Vulnerability Description
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 88.0 |
| Mozilla | Firefox Esr | < 78.10 |
| Mozilla | Thunderbird | < 78.10 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1699835Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1699835Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release NotesVendor Advisory
FAQ
What is CVE-2021-23995?
CVE-2021-23995 is a vulnerability with a CVSS score of 8.8 (HIGH). When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnera...
How severe is CVE-2021-23995?
CVE-2021-23995 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-2021-23995?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.