CVE-2021-23958 is a medium-severity vulnerability affecting Mozilla Firefox versions prior to 85, where a browser confusion flaw could lead to unintended screen sharing state transfer between tabs, potentially leaking sensitive information. The attack requires user interaction (UI:R) and can be executed over a network (AV:N), resulting in high confidentiality impact (C:H) without affecting integrity or availability. While the vulnerability has a CVSS score of 6.5, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, and it has received limited community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 85.0CPE 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:U/C:H/I:N/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.