Security advisory

{
  "id": "c131b10f6aa66e75d7d818ee9802e480dd7f39c779a83cc4cbfd081ae0e6201a",
  "url": "https://osv.dev/vulnerability/CVE-2021-43521",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43521",
    "summary": "A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.",
    "evidence": "osv:CVE-2021-43521",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-43521",
      "aliases": [
        "CVE-2021-43521"
      ],
      "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/hardysimpson/zlog",
              "type": "GIT",
              "events": [
                {
                  "introduced": "876099f3c66033f3de11d79f63814766b1021dbe"
                },
                {
                  "last_affected": "876099f3c66033f3de11d79f63814766b1021dbe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:zlog_project:zlog:1.2.15:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.2.15"
                      },
                      {
                        "last_affected": "1.2.15"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.2.15"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43521.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:09.342250869Z",
      "provider": "osv",
      "references": [
        "https://github.com/HardySimpson/zlog/issues/206",
        "https://github.com/HardySimpson/zlog"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-43521",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384905,
  "published_at": "2022-04-08T16:15:08.2+00:00"
}