Security advisory

{
  "id": "eff60a18e03090bdbe74fc2607cce9f6962605c10a9efd61aa2b2dd558bf1371",
  "url": "https://osv.dev/vulnerability/CVE-2021-41687",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41687",
    "summary": "DCMTK through 3.6.6 does not handle memory free properly. The program malloc a heap memory for parsing data, but does not free it when error in parsing. Sending specific requests to the dcmqrdb program incur the memory leak. An attacker can use it to launch a DoS attack.",
    "evidence": "osv:CVE-2021-41687",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-41687",
      "aliases": [
        "CVE-2021-41687"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dcmtk/dcmtk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "6cb30bd7fb42190e0188afbd8cb961c62a6fb9c9"
                },
                {
                  "fixed": "a9697dfeb672b0b9412c00c7d36d801e27ec85cb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:offis:dcmtk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.6.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a9697dfeb672b0b9412c00c7d36d801e27ec85cb"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "DCMTK-3.6.5",
            "DCMTK-3.6.6",
            "DCMTK-3.6.5+_20191213",
            "DCMTK-3.6.4",
            "DCMTK-3.6.3",
            "DCMTK-3.6.2",
            "DCMTK-3.6.1_20170228",
            "DCMTK-3.6.1_20161102",
            "DCMTK-3.6.1_20160630",
            "DCMTK-3.6.1_20160216",
            "DCMTK-3.6.1_20150924",
            "DCMTK-3.6.1_20150629",
            "DCMTK-3.6.1_20150217",
            "DCMTK-3.6.1_20140617",
            "DCMTK-3.6.1_20131114",
            "DCMTK-3.6.1_20121102",
            "DCMTK-3.6.1_20120831",
            "DCMTK-3.6.1_20120515",
            "DCMTK-3.6.1_20120222",
            "DCMTK-3.6.1_20111208",
            "DCMTK-3.6.1_20110922",
            "DCMTK-3.6.1_20110707",
            "DCMTK-3.6.1_20110519",
            "DCMTK-3.6.1_20110225",
            "DCMTK-3.6.0",
            "DCMTK-3.5.4",
            "DCMTK-3.5.3",
            "DCMTK-3.5.2a",
            "DCMTK-3.5.2",
            "DCMTK-3.5.1",
            "DCMTK-3.5.0",
            "DCMTK-3.4.2",
            "DCMTK-3.4.1",
            "DCMTK-3.4.0",
            "DCMTK-3.3.1",
            "DCMTK-3.3.0",
            "DCMTK-3.2.1",
            "DCMTK-3.2.0",
            "DCMTK-3.1.2",
            "DCMTK-3.1.1",
            "DCMTK-3.1.0",
            "CAR96-3.0.2",
            "CAR96-3.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41687.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:01.704839087Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00022.html",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00032.html",
        "https://github.com/DCMTK/dcmtk/commit/a9697dfeb672b0b9412c00c7d36d801e27ec85cb",
        "https://github.com/DCMTK/dcmtk"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41687",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384819,
  "published_at": "2022-06-28T13:15:10.213+00:00"
}