CVE-2021-29961

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CVSS 3.1

4.3 medium

EPSS

<1%p53

Published

Jun 24, 2021 (Jun 24, 2021)

Modified

Jun 17, 2026

Description

When styling and rendering an oversized ` ` element, Firefox did not apply correct clipping which allowed an attacker to paint over the user interface. This vulnerability affects Firefox < 89.

Vendors: mozilla
Products: firefox
Weakness: CWE-863
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.8%)

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