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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.014 (71.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2020-18/ (Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2020-16/ (Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2020-17/ (Third Party Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- usn.ubuntu.com/4373-1/ (vendor-advisory, Broken Link)
- security.gentoo.org/glsa/202005-03 (Third Party Advisory)
- security.gentoo.org/glsa/202005-04 (Third Party Advisory)
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.