Auth bypass in Mozilla Firefox
CVE-2021-29961
When styling and rendering an oversized `<select>` element, Firefox did not apply correct clipping which allowed an attacker to paint over the user interface. This vulnerability affects Firefox < 89.
Vulnerability class: Broken Access Control
EPSS: 0.008 (51.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Mozilla Firefox — versions unspecified
Weakness classification (CWE)
References
- security@mozilla.org (x_refsource_MISC, Release Notes, Vendor Advisory)
- security@mozilla.org (x_refsource_MISC, Issue Tracking, Broken Link, Vendor Advisory)
- security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2021-29961?
- CVE-2021-29961 is a medium-severity vulnerability in Mozilla Firefox, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2021-06-24.
- How severe is CVE-2021-29961?
- Medium severity. CVSS v3 base score is 4.3 out of 10.