Security advisory

{
  "id": "ba44ffc9da6428697df944f87c702548cc3a48102195a6383b14ef524b6e7cbf",
  "url": "https://osv.dev/vulnerability/CVE-2019-18976",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-18976",
    "summary": "An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.",
    "evidence": "osv:CVE-2019-18976",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-18976",
      "aliases": [
        "CVE-2019-18976"
      ],
      "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/asterisk/asterisk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "85335355efb2d7914a1fe20ed31afcef15fd210c"
                },
                {
                  "last_affected": "fb53d3a79072ed172de6a0b88b801fdf9131d079"
                },
                {
                  "introduced": "f71a36701674cf50c47d91c403e824b9cc4868a7"
                },
                {
                  "last_affected": "bb3e299589a06b7cf5bdd06a117332eaf3cf0f4d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "last_affected": "13.29.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:certified_asterisk:13.21:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.21"
                      },
                      {
                        "last_affected": "13.21"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.21-cert1"
                      },
                      {
                        "last_affected": "13.21-cert1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.21-cert2"
                      },
                      {
                        "last_affected": "13.21-cert2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:certified_asterisk:13.21:cert3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.21-cert3"
                      },
                      {
                        "last_affected": "13.21-cert3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:certified_asterisk:13.21:cert4:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.21-cert4"
                      },
                      {
                        "last_affected": "13.21-cert4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "13.21",
            "13.21-cert1",
            "13.21-cert2",
            "13.21-cert3",
            "13.21-cert4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18976.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:59.857680587Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html",
        "https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html",
        "https://seclists.org/fulldisclosure/2019/Nov/20",
        "https://www.asterisk.org/downloads/security-advisories",
        "https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-18976",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 439410,
  "published_at": "2019-11-22T17:15:11.833+00:00"
}