CVE-2021-33318 is an input validation vulnerability affecting Joel Christner's .NET C# packages WatsonWebserver (versions 4.1.3 and below) and IpMatcher (versions 1.0.4.1 and below). This flaw stems from insufficient validation of IP addresses and netmasks against internal matcher lists. It carries a critical CVSS score of 9.8, indicating a network-exploitable vulnerability with low attack complexity, requiring no user interaction, and potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.0.4.1CPE matchmatch criteria | cpe:2.3:a:ipmatcher_project:ipmatcher:*:*:*:*:*:*:*:* | ||
<= 4.1.3CPE matchmatch criteria | cpe:2.3:a:watsonwebserver_project:watsonwebserver:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/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.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.