Security advisory

{
  "id": "e24d719204b1d7292e92c0d00b2029677c3452bac75131df28f791a76eb7fc54",
  "url": "https://osv.dev/vulnerability/CVE-2021-33318",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33318",
    "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.",
    "evidence": "osv:CVE-2021-33318",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-33318",
      "aliases": [
        "CVE-2021-33318",
        "GHSA-qj93-37f5-mr29"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jchristn/ipmatcher",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "81d77c2f33aa912dbd032b34b9e184fc6e041d89"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "81d77c2f33aa912dbd032b34b9e184fc6e041d89"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33318.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:44.101614108Z",
      "provider": "osv",
      "references": [
        "https://github.com/jchristn/IpMatcher",
        "https://github.com/jchristn/WatsonWebserver",
        "https://github.com/jchristn/IpMatcher/commit/81d77c2f33aa912dbd032b34b9e184fc6e041d89",
        "https://github.com/kaoudis/advisories/blob/main/0-2021.md"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:ipmatcher_project:ipmatcher:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "ipmatcher_project:ipmatcher",
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.0.4.1"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:watsonwebserver_project:watsonwebserver:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "watsonwebserver_project:watsonwebserver",
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "4.1.3"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.0.4.1"
                  },
                  {
                    "last_affected": "4.1.3"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-33318",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386038,
  "published_at": "2022-05-16T16:15:07.81+00:00"
}