Security advisory

{
  "id": "f83829548d4d89df219ac926ed2c2935b7d6d2936c35f98cfd98490420d606ad",
  "url": "https://osv.dev/vulnerability/CVE-2021-41821",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41821",
    "summary": "Wazuh Manager in Wazuh through 4.1.5 is affected by a remote Integer Underflow vulnerability that might lead to denial of service. A crafted message must be sent from an authenticated agent to the manager.",
    "evidence": "osv:CVE-2021-41821",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-41821",
      "aliases": [
        "CVE-2021-41821"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wazuh/wazuh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "c9b0b1d73b3884cacf4c20a24489c7bcfae06d63"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.1.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.1.5",
            "v4.1.2",
            "v4.1.4",
            "v4.1.3",
            "v3.13.1",
            "v3.13.0",
            "v3.12.0",
            "v3.8.0",
            "v3.7.0",
            "v3.6.1",
            "v3.6.0",
            "v3.5.0",
            "v3.2.0",
            "v3.1.0",
            "v2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41821.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:59.354500964Z",
      "provider": "osv",
      "references": [
        "https://documentation.wazuh.com/current/release-notes/release_4_2_0.html",
        "https://github.com/wazuh/wazuh/issues/9201"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41821",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386639,
  "published_at": "2021-09-29T23:15:07.35+00:00"
}