Use After Free in Mozilla Firefox
CVE-2020-12405
When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.014 (70.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.4% 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
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2020-20/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-21/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-22/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- usn.ubuntu.com/4421-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12405?
- CVE-2020-12405 is a medium-severity vulnerability in Mozilla Firefox, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.3/10. Published 2020-07-09.
- How severe is CVE-2020-12405?
- Medium severity. CVSS v3 base score is 5.3 out of 10.