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CVE-2021-33318 — Improper Input Validation in IpMatcher — CVE Details

CRITICAL

Improper Input Validation in IpMatcher

Published May 17, 2022Updated February 16, 2024Source: osv

Summary

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.

Advisory Timeline

  • First published May 17, 2022 (1609 days ago).
  • Last revised February 16, 2024 — 640 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update IpMatcher to 1.0.4.2 or later
dotnet add package IpMatcher --version 1.0.4.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
IpMatcher
nuget
1.0.0, 1.0.1, 1.0.3, 1.0.4 (+1 more)1.0.4.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2021-33318?
Improper Input Validation in IpMatcher This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-33318?
CVE-2021-33318 affects IpMatcher. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-33318 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-qj93-37f5-mr29

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