CVE-2021-23406 is a critical vulnerability affecting the pac-resolver package prior to version 5.0.0, stemming from unsafe handling of PAC files when processing untrusted input. This flaw carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low attack complexity, and high potential for confidentiality, integrity, and availability impacts. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating awareness within the cybersecurity community. The fix for this vulnerability is implemented in the node-degenerator library, a dependency maintained by the same developer.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.0.0CPE matchmatch criteria | cpe:2.3:a:pac-resolver_project:pac-resolver:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.