Security advisory

{
  "id": "0226db6f4ae7d0d353335c10b706841b1470a721209ad897664ab5dab30ac5bf",
  "url": "https://osv.dev/vulnerability/CVE-2021-44847",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-44847",
    "summary": "A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11 and 0.2.0 through 0.2.12 (caused by an improper length calculation during the handling of received network packets) allows remote attackers to crash the process or potentially execute arbitrary code via a network packet.",
    "evidence": "osv:CVE-2021-44847",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-44847",
      "aliases": [
        "CVE-2021-44847"
      ],
      "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/toktok/c-toxcore",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a429ef4a28a5e5e0ad010efffb76d2abc3ada0af"
                },
                {
                  "last_affected": "fc0cc08b2115d037551369f69519e95e841643aa"
                },
                {
                  "introduced": "5a45008ab91a65ab6c907efebf822612a17a639f"
                },
                {
                  "last_affected": "9be4dbb4335bf7d893c8d00566d3276ab6dedd14"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:toktok:toxcore:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.1.9"
                      },
                      {
                        "last_affected": "0.1.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:toktok:toxcore:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.2.0"
                      },
                      {
                        "last_affected": "0.2.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.2.12",
            "v0.2.11",
            "v0.2.10",
            "v0.2.9",
            "v0.2.8",
            "v0.2.7",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.11",
            "v0.1.10",
            "v0.1.9"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44847.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:06.809222515Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7EBS3NIRYJ7V3PTNINP3PJSVUHGZTGA/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLTKINSPO5T65LB3ZASDPCREKUE22RYE/",
        "https://github.com/TokTok/c-toxcore/pull/1718"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  },
                  {
                    "introduced": "35"
                  },
                  {
                    "last_affected": "35"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-44847",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386911,
  "published_at": "2021-12-13T01:15:07.73+00:00"
}