Cyber Resilience

CVE-2021-33318

CriticalPublic PoC

Published: 16 May 2022

Published
16 May 2022
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0074 73.5th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33318 is a critical-severity Incorrect Type Conversion or Cast (CWE-704) vulnerability in Ipmatcher Project Ipmatcher. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 26.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

more

and subnets.

CWE(s)
CWE-704

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

ipmatcher project
ipmatcher
≤ 1.0.4.1
watsonwebserver project
watsonwebserver
≤ 4.1.3

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References