Security advisory

{
  "id": "5b0bc75deae2be007cae05dfe182ca85ca67c096e0f483b92a4d2efe4b8abed5",
  "url": "https://osv.dev/vulnerability/CVE-2020-8443",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8443",
    "summary": "In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to an off-by-one heap-based buffer overflow during the cleaning of crafted syslog msgs (received from authenticated remote agents and delivered to the analysisd processing queue by ossec-remoted).",
    "evidence": "osv:CVE-2020-8443",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-8443",
      "aliases": [
        "CVE-2020-8443"
      ],
      "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/ossec/ossec-hids",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ec19fd9e712e8ee710ec7d29b9f1476a95913db8"
                },
                {
                  "last_affected": "b1d087f83cd9693841f2baeede532397fbfa2d03"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ossec:ossec:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.7"
                      },
                      {
                        "last_affected": "3.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.0",
            "3.4.0",
            "3.3.0",
            "3.2.0",
            "3.1.0",
            "3.0beta03",
            "3.0.0",
            "3.0beta2",
            "3.0beta02",
            "3.0beta01",
            "v2.9.0beta05",
            "2.9.0-beta03",
            "2.9.0-beta02",
            "2.9.0-beta01",
            "snapshot/20150112",
            "v2.8.0",
            "v2.7.1",
            "v2.7"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8443.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:31.677848524Z",
      "provider": "osv",
      "references": [
        "https://github.com/ossec/ossec-hids/issues/1821",
        "https://security.gentoo.org/glsa/202007-33",
        "https://www.ossec.net/",
        "https://github.com/ossec/ossec-hids/issues/1816"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8443",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384397,
  "published_at": "2020-01-30T01:15:10.777+00:00"
}