Vulnerability Description
Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 87.0 |
| Mozilla | Firefox Esr | < 78.9 |
| Mozilla | Thunderbird | < 78.9 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1513519%2C1683439%2C1690169%2C16Issue TrackingPatchVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1513519%2C1683439%2C1690169%2C16Issue TrackingPatchVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory
FAQ
What is CVE-2021-23987?
CVE-2021-23987 is a vulnerability with a CVSS score of 8.8 (HIGH). Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. Some of these bugs showed evidence of memory corruption and we presume that with enough...
How severe is CVE-2021-23987?
CVE-2021-23987 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-2021-23987?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.