Use After Free in Mozilla Firefox
CVE-2020-12387
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.
Vulnerability class: Race Condition
EPSS: 0.014 (69.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox_esr
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking)
- security@mozilla.org (x_refsource_UBUNTU, vendor-advisory, Broken Link)
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-12387?
- CVE-2020-12387 is a high-severity vulnerability in Mozilla Firefox, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2020-05-26.
- How severe is CVE-2020-12387?
- High severity. CVSS v3 base score is 8.1 out of 10.