Use After Free in Mozilla Firefox
CVE-2019-11757
When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
Vulnerability class: Use-After-Free
EPSS: 0.013 (68.3th 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 before 70
- Mozilla Firefox Esr — versions before 68.2
- Mozilla Firefox_esr
- Mozilla Thunderbird — versions before 68.2
- Canonical Ubuntu_linux — versions 16.04
Weakness classification (CWE)
References
- security@mozilla.org (x_refsource_CONFIRM, Vendor Advisory)
- security@mozilla.org (x_refsource_CONFIRM, Vendor Advisory)
- security@mozilla.org (x_refsource_CONFIRM, Vendor Advisory)
- security@mozilla.org (Permissions Required, x_refsource_CONFIRM, Issue Tracking)
- security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- security@mozilla.org (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-11757?
- CVE-2019-11757 is a high-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 8.8/10. Published 2020-01-08.
- How severe is CVE-2019-11757?
- High severity. CVSS v3 base score is 8.8 out of 10.