Use After Free in Mozilla Firefox
CVE-2020-12420
When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.
Vulnerability class: Race Condition
EPSS: 0.019 (77.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
- Canonical Ubuntu_linux — versions 16.04, 18.04, 19.10
- Opensuse Leap — versions 15.1, 15.2
Weakness classification (CWE)
References
- security@mozilla.org (x_refsource_MISC, Vendor Advisory)
- security@mozilla.org (x_refsource_MISC, Vendor Advisory)
- security@mozilla.org (x_refsource_MISC, Vendor Advisory)
- security@mozilla.org (Exploit, x_refsource_MISC, Issue Tracking, Vendor Advisory)
- security@mozilla.org (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@mozilla.org (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@mozilla.org (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@mozilla.org (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- security@mozilla.org (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2020-12420?
- CVE-2020-12420 is a high-severity vulnerability in Mozilla Firefox, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.8/10. Published 2020-07-09.
- How severe is CVE-2020-12420?
- High severity. CVSS v3 base score is 8.8 out of 10.