CVE-2021-33318

PoC —

CVSS 3.1

9.8 critical

EPSS

2%p80

Published

May 16, 2022 (May 16, 2022)

Modified

Jun 17, 2026

Description

An Input Validation Vulnerability exists in Joel Christner .NET C# packages WatsonWebserver, IpMatcher 1.0.4.1 and below (IpMatcher) and 4.1.3 and below (WatsonWebserver) due to insufficient validation of input IP addresses and netmasks against the internal Matcher list of IP addresses and subnets.

Vendors: ipmatcher project watsonwebserver project
Products: ipmatcher, watsonwebserver
Weakness: CWE-704
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (2.0%)

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