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asterisk — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2020-35776

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.

Products
asterisk
Affected versions
1:13.1.0~dfsg-1.1ubuntu3, 1:13.1.0~dfsg-1.1ubuntu4, 1:13.1.0~dfsg-1.1ubuntu4.1, 1:13.1.0~dfsg-1.1ubuntu4.1+esm1, 1:13.17.2~dfsg-1ubuntu1, 1:13.17.2~dfsg-2ubuntu1, 1:13.18.1~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu2, 1:13.18.3~dfsg-1ubuntu3, 1:13.18.3~dfsg-1ubuntu4, 1:16.16.1~dfsg+~2.10-1, 1:16.16.1~dfsg-2, 1:16.16.1~dfsg-4, 1:16.16.1~dfsg-4build1, 1:16.2.1~dfsg-2build2, 1:16.2.1~dfsg-2build3, 1:16.2.1~dfsg-2ubuntu1, 1:18.10.0~dfsg+~cs6.10.40431411-2, 1:20.4.0~dfsg+~cs6.13.40431414-2, 1:20.5.0~dfsg+~cs6.13.40431414-1, 1:20.5.1~dfsg+~cs6.13.40431414-1, 1:20.5.2~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-2, 1:20.6.0~dfsg+~cs6.13.40431414-2build3, 1:20.6.0~dfsg+~cs6.13.40431414-2build4, 1:20.6.0~dfsg+~cs6.13.40431414-2build5, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3, 1:22.2.0~dfsg+~cs6.15.60671435-2, 1:22.3.0~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-2, 1:22.5.1~dfsg+~cs6.15.60671435-1, 1:22.5.2~dfsg+~cs6.15.60671435-1
Fixed versions
Not specified
CVEs
CVE-2020-35776
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 00:52 UTC · Revision 1

Source evidence

UBUNTU-CVE-2020-35776

core-osv · Original source

Published 18 Feb 2021, 20:15 UTC

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.

osv:UBUNTU-CVE-2020-35776

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

asterisk

Fixed versions: Not specified

Complete source record
{
  "id": "c22f5a0d3194893227b3547bb62644446cc3a6e4df6ed3fa04c59f9e91658d74",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-35776",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-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:UBUNTU-CVE-2020-35776",
    "products": [
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:13.1.0~dfsg-1.1ubuntu3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:13.1.0~dfsg-1.1ubuntu4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:13.1.0~dfsg-1.1ubuntu4.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:13.17.2~dfsg-1ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.17.2~dfsg-2ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.18.1~dfsg-1ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.18.3~dfsg-1ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.18.3~dfsg-1ubuntu2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.18.3~dfsg-1ubuntu3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:13.18.3~dfsg-1ubuntu4",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:16.2.1~dfsg-2build2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1:16.2.1~dfsg-2build3",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1:16.2.1~dfsg-2ubuntu1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:16.16.1~dfsg-2",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1:16.16.1~dfsg-4",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1:16.16.1~dfsg-4build1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1:16.16.1~dfsg+~2.10-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1:18.10.0~dfsg+~cs6.10.40431411-2",
            "evidence": "/affected/3/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:20.4.0~dfsg+~cs6.13.40431414-2",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.5.0~dfsg+~cs6.13.40431414-1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.5.1~dfsg+~cs6.13.40431414-1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.5.2~dfsg+~cs6.13.40431414-1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.6.0~dfsg+~cs6.13.40431414-1",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.6.0~dfsg+~cs6.13.40431414-2",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.6.0~dfsg+~cs6.13.40431414-2build3",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.6.0~dfsg+~cs6.13.40431414-2build4",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:20.6.0~dfsg+~cs6.13.40431414-2build5",
            "evidence": "/affected/4/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:22.2.0~dfsg+~cs6.15.60671435-2",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:22.3.0~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:22.4.1~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:22.4.1~dfsg+~cs6.15.60671435-2",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:22.5.1~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/5/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/6/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/6/versions"
          },
          {
            "value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2",
            "evidence": "/affected/6/versions"
          },
          {
            "value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3",
            "evidence": "/affected/6/versions"
          }
        ]
      },
      {
        "name": {
          "value": "asterisk",
          "evidence": "/affected/7/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
            "evidence": "/affected/7/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2020-35776",
      "aliases": [
        "UBUNTU-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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "asterisk",
            "purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=esm-apps%2Fxenial",
            "ecosystem": "Ubuntu:Pro:16.04:LTS"
          },
          "versions": [
            "1:13.1.0~dfsg-1.1ubuntu3",
            "1:13.1.0~dfsg-1.1ubuntu4",
            "1:13.1.0~dfsg-1.1ubuntu4.1",
            "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35776.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "asterisk",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-config",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-dahdi",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-mobile",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-modules",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-mp3",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-mysql",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-ooh323",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-voicemail",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-voicemail-imapstorage",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-voicemail-odbcstorage",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              },
              {
                "binary_name": "asterisk-vpb",
                "binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "asterisk",
            "purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "1:13.17.2~dfsg-1ubuntu1",
            "1:13.17.2~dfsg-2ubuntu1",
            "1:13.18.1~dfsg-1ubuntu1",
            "1:13.18.3~dfsg-1ubuntu1",
            "1:13.18.3~dfsg-1ubuntu2",
            "1:13.18.3~dfsg-1ubuntu3",
            "1:13.18.3~dfsg-1ubuntu4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35776.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "asterisk",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-config",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-dahdi",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-mobile",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-modules",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-mp3",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-mysql",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-ooh323",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-tests",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-voicemail",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-voicemail-imapstorage",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-voicemail-odbcstorage",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              },
              {
                "binary_name": "asterisk-vpb",
                "binary_version": "1:13.18.3~dfsg-1ubuntu4"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "asterisk",
            "purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=focal",
            "ecosystem": "Ubuntu:20.04:LTS"
          },
          "versions": [
            "1:16.2.1~dfsg-2build2",
            "1:16.2.1~dfsg-2build3",
            "1:16.2.1~dfsg-2ubuntu1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35776.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "asterisk",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-config",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-dahdi",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-mobile",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-modules",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-mp3",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-mysql",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-ooh323",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-tests",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-voicemail",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-voicemail-imapstorage",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-voicemail-odbcstorage",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              },
              {
                "binary_name": "asterisk-vpb",
                "binary_version": "1:16.2.1~dfsg-2ubuntu1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "asterisk",
            "purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1:16.16.1~dfsg-2",
            "1:16.16.1~dfsg-4",
            "1:16.16.1~dfsg-4build1",
            "1:16.16.1~dfsg+~2.10-1",
            "1:18.10.0~dfsg+~cs6.10.40431411-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35776.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "asterisk",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-config",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-dahdi",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-mobile",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-modules",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-mp3",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-mysql",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-ooh323",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-tests",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              },
              {
                "binary_name": "asterisk-vpb",
                "binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "asterisk",
            "purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "1:20.4.0~dfsg+~cs6.13.40431414-2",
            "1:20.5.0~dfsg+~cs6.13.40431414-1",
            "1:20.5.1~dfsg+~cs6.13.40431414-1",
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      "modified": "2026-10-17T12:56:14.288505034Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-35776"
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      "references": [
        "https://ubuntu.com/security/CVE-2020-35776",
        "https://downloads.asterisk.org/pub/security/AST-2021-001.html",
        "https://issues.asterisk.org/jira/browse/ASTERISK-29227",
        "https://issues.asterisk.org/",
        "https://www.cve.org/CVERecord?id=CVE-2020-35776"
      ]
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    "related_cves": [
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        "value": "CVE-2020-35776",
        "evidence": "/upstream"
      }
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 354997,
  "published_at": "2021-02-18T20:15:00+00:00"
}