Security advisory

{
  "id": "a0ca039fa831dde731e34a1e41180da0bcdb277c896938ecac474277d35f5090",
  "url": "https://osv.dev/vulnerability/CVE-2021-47154",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-47154",
    "summary": "The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses.",
    "evidence": "osv:CVE-2021-47154",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-47154",
      "aliases": [
        "CVE-2021-47154"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stigtsp/net-cidr-lite",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "71aca53d2f2ad8c4058df7a80a01f599bb6118f0"
                },
                {
                  "fixed": "23b6ff0590dc279521863a502e890ef19a5a76fc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.22"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "23b6ff0590dc279521863a502e890ef19a5a76fc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.21"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47154.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:11.621269108Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2024/03/msg00023.html",
        "https://metacpan.org/dist/Net-CIDR-Lite/changes",
        "https://metacpan.org/pod/Net::CIDR::Lite",
        "https://github.com/stigtsp/Net-CIDR-Lite/commit/23b6ff0590dc279521863a502e890ef19a5a76fc",
        "https://blog.urth.org/2021/03/29/security-issues-in-perl-ip-address-distros/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-47154",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387041,
  "published_at": "2024-03-18T05:15:06.14+00:00"
}