Security advisory

{
  "id": "d15dc98f63018438cbbf984e2f2ead1c218f9a995047c502632bba66c08043f4",
  "url": "https://osv.dev/vulnerability/CVE-2021-27213",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27213",
    "summary": "config.py in pystemon before 2021-02-13 allows code execution via YAML deserialization because SafeLoader and safe_load are not used.",
    "evidence": "osv:CVE-2021-27213",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-27213",
      "aliases": [
        "CVE-2021-27213"
      ],
      "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/cvandeplas/pystemon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dbeb87afefdb63de2f4cff69b6f10c5965d14b54"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "dbeb87afefdb63de2f4cff69b6f10c5965d14b54"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27213.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.295991214Z",
      "provider": "osv",
      "references": [
        "https://github.com/cvandeplas/pystemon/commit/dbeb87afefdb63de2f4cff69b6f10c5965d14b54",
        "https://www.huntr.dev/bounties/1-other-pystemon/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:pystemon_project:pystemon:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "pystemon_project:pystemon",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-02-13"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-02-13"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-27213",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385675,
  "published_at": "2021-02-14T04:15:12.837+00:00"
}