Vulnerability Description
Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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 < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 86.0 |
| Mozilla | Firefox Esr | < 78.8 |
| Mozilla | Thunderbird | < 78.8 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C168Broken LinkIssue TrackingVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00000.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202104-09Third Party Advisory
- https://security.gentoo.org/glsa/202104-10Third Party Advisory
- https://www.debian.org/security/2021/dsa-4866Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-08/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-09/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C168Broken LinkIssue TrackingVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00000.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202104-09Third Party Advisory
- https://security.gentoo.org/glsa/202104-10Third Party Advisory
- https://www.debian.org/security/2021/dsa-4866Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-08/Release NotesVendor Advisory
FAQ
What is CVE-2021-23978?
CVE-2021-23978 is a vulnerability with a CVSS score of 8.8 (HIGH). Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these ...
How severe is CVE-2021-23978?
CVE-2021-23978 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-2021-23978?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Debian Debian Linux.