CVE-2021-23974 describes a medium-severity vulnerability in Mozilla Firefox versions prior to 86, where the DOMParser API improperly handled '<noscript>' elements, enabling a mutation XSS (mXSS) attack to bypass HTML sanitizers. This client-side vulnerability requires user interaction (UI:R) and could lead to low impact on confidentiality and integrity (C:L, I:L). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, with its EPSS score indicating a very low likelihood of exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 86.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.