Vulnerability Description
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 76.0 |
| Mozilla | Firefox Esr | < 68.8.0 |
| Mozilla | Thunderbird | < 68.8.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1545345Issue TrackingPermissions Required
- https://security.gentoo.org/glsa/202005-03Third Party Advisory
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://usn.ubuntu.com/4373-1/Broken Link
- https://www.mozilla.org/security/advisories/mfsa2020-16/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-17/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-18/Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1545345Issue TrackingPermissions Required
- https://security.gentoo.org/glsa/202005-03Third Party Advisory
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://usn.ubuntu.com/4373-1/Broken Link
- https://www.mozilla.org/security/advisories/mfsa2020-16/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-17/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-18/Third Party Advisory
FAQ
What is CVE-2020-12387?
CVE-2020-12387 is a vulnerability with a CVSS score of 8.1 (HIGH). A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firef...
How severe is CVE-2020-12387?
CVE-2020-12387 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12387?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.