VulnerabilityModified
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.
MEDIUM 4.3EPSS 0.76%
Does this matter?
Lower severity and a low EPSS score (0.76%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- EPSS
- 0.76% probability · 53th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1700235Broken Link, Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/202107-09Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1700235Broken Link, Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/202107-09Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.