Security advisory

{
  "id": "f4fe59ac15122b2182e6afca5db02f9deeb06a6b6a52d63cc20339de8b5410ec",
  "url": "https://osv.dev/vulnerability/CVE-2021-43400",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43400",
    "summary": "An issue was discovered in gatt-database.c in BlueZ 5.61. A use-after-free can occur when a client disconnects during D-Bus processing of a WriteValue call.",
    "evidence": "osv:CVE-2021-43400",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-43400",
      "aliases": [
        "CVE-2021-43400"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bluez/bluez",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d61f9dc54c04f4fc5791398a0dbae59d671846bf"
                },
                {
                  "last_affected": "d61f9dc54c04f4fc5791398a0dbae59d671846bf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bluez:bluez:5.61:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.61"
                      },
                      {
                        "last_affected": "5.61"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.61"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43400.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:55.053462222Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2024/09/msg00022.html",
        "https://lists.debian.org/debian-lts-announce/2022/10/msg00026.html",
        "https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=838c0dc7641e1c991c0f3027bf94bee4606012f8"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-43400",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438342,
  "published_at": "2021-11-04T23:15:10.35+00:00"
}