Critical severity9.8NVD Advisory· Published May 16, 2022· Updated Jun 17, 2026
CVE-2021-33318
CVE-2021-33318
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
IpMatcherNuGet | < 1.0.4.2 | 1.0.4.2 |
Affected products
4- cpe:2.3:a:watsonwebserver_project:watsonwebserver:*:*:*:*:*:*:*:*Range: <=4.1.3
- Joel Christner .NET C# packages/WatsonWebserver, IpMatcherdescription
Patches
Vulnerability mechanics
References
4- github.com/jchristn/IpMatcher/commit/81d77c2f33aa912dbd032b34b9e184fc6e041d89nvdPatchThird Party AdvisoryWEB
- github.com/kaoudis/advisories/blob/main/0-2021.mdnvdExploitThird Party AdvisoryWEB
- github.com/advisories/GHSA-qj93-37f5-mr29ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-33318ghsaADVISORY
News mentions
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