VulnerabilityModified
CVE-2020-12387
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability.
HIGH 8.1EPSS 1.40%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.40% probability · 71th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362, CWE-416
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1545345Issue Tracking, Permissions 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 Tracking, Permissions 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.