Security advisory

{
  "id": "99d3cedd86e9162ff75062a34f8a5ec35ea5f67d6d5b60efe7b92f4e43e414b4",
  "url": "https://osv.dev/vulnerability/CVE-2020-35776",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-35776",
    "summary": "A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.",
    "evidence": "osv:CVE-2020-35776",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-35776",
      "aliases": [
        "CVE-2020-35776"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/asterisk/asterisk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "85335355efb2d7914a1fe20ed31afcef15fd210c"
                },
                {
                  "last_affected": "3f100c22d4664012247efed391c595833a15d7ee"
                },
                {
                  "introduced": "a65908f83e2f17a3aca7eb39c8e06045aca02674"
                },
                {
                  "last_affected": "105df4b089e19c7e296d425965623f3428720cd1"
                },
                {
                  "introduced": "5ffe12b6ef30cd503f85d75745fd8d9c2cfafe47"
                },
                {
                  "last_affected": "1edb44b2a9e6d68cfccf4339044751c8830e1d14"
                },
                {
                  "introduced": "2c1bba3cbec008c8ce35c78a2c79f9f207ea58bc"
                },
                {
                  "last_affected": "fd5b3a1b6f686db27f98281ec21a9c8fb04a787c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "last_affected": "13.38.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "16.0.0"
                      },
                      {
                        "last_affected": "16.15.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "17.0.0"
                      },
                      {
                        "last_affected": "17.9.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "18.0"
                      },
                      {
                        "last_affected": "18.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35776.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.872701566Z",
      "provider": "osv",
      "references": [
        "https://downloads.asterisk.org/pub/security/AST-2021-001.html",
        "https://issues.asterisk.org/",
        "https://issues.asterisk.org/jira/browse/ASTERISK-29227"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-35776",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429878,
  "published_at": "2021-02-18T20:15:12.447+00:00"
}