Vulnerability-Lookup

ubuntu-cve-2023-49786

Vulnerability from osv_ubuntu

Published

2023-12-14 20:15

Modified

2026-05-20 15:02

Summary

Details

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-49786	REPORT
	https://www.cve.org/CVERecord?id=CVE-2023-49786	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:13.1.0~dfsg-1.1ubuntu4.1+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:13.18.3~dfsg-1ubuntu4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:16.2.1~dfsg-2ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:16.2.1~dfsg-2build2",
        "1:16.2.1~dfsg-2build3",
        "1:16.2.1~dfsg-2ubuntu1"
      ]
    },
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:18.10.0~dfsg+~cs6.10.40431411-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "asterisk",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-config",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-dahdi",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-mobile",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-modules",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-mp3",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-mysql",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-ooh323",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          },
          {
            "binary_name": "asterisk-tests",
            "binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:20.6.0~dfsg+~cs6.13.40431414-2build5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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",
        "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"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "asterisk",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-config",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-dahdi",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mobile",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-modules",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mp3",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mysql",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-ooh323",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-tests",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:22.5.2~dfsg+~cs6.15.60671435-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "asterisk",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-config",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-dahdi",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mobile",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-modules",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mp3",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mysql",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-ooh323",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-tests",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:22.5.2~dfsg+~cs6.15.60671435-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:22.5.2~dfsg+~cs6.15.60671435-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.",
  "id": "UBUNTU-CVE-2023-49786",
  "modified": "2026-05-20T15:02:57Z",
  "published": "2023-12-14T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-49786"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-49786"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-49786"
  ]
}

CVE-2023-49786 (GCVE-0-2023-49786)

Vulnerability from cvelistv5 – Published: 2023-12-14 19:47 – Updated: 2025-02-13 17:18

Title

Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-08 14:19 UTC

CWE

CWE-703 - Improper Check or Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/asterisk/asterisk/security/adv…	x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/d7d77…	x_refsource_MISC
https://github.com/EnableSecurity/advisories/tree…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2023/12/15/7
http://packetstormsecurity.com/files/176251/Aster…
http://seclists.org/fulldisclosure/2023/Dec/24
https://lists.debian.org/debian-lts-announce/2023…

Impacted products

1 product

Vendor	Product	Version
asterisk	asterisk	Affected: < 18.20.1 Affected: >= 19.0.0, < 20.5.1 Affected: = 21.0.0 Affected: < 18.9-cert6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T22:01:25.997Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq"
          },
          {
            "name": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05",
            "tags": [
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              "x_transferred"
            ],
            "url": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05"
          },
          {
            "name": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2023/12/15/7"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2023/Dec/24"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-49786",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-08T14:19:55.907894Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-08T14:20:19.222Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "asterisk",
          "vendor": "asterisk",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 18.20.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 19.0.0, \u003c 20.5.1"
            },
            {
              "status": "affected",
              "version": "= 21.0.0"
            },
            {
              "status": "affected",
              "version": "\u003c 18.9-cert6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-703",
              "description": "CWE-703: Improper Check or Handling of Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2023-12-29T00:06:18.647Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05"
        },
        {
          "name": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race"
        },
        {
          "url": "http://www.openwall.com/lists/oss-security/2023/12/15/7"
        },
        {
          "url": "http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2023/Dec/24"
        },
        {
          "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"
        }
      ],
      "source": {
        "advisory": "GHSA-hxj9-xwr8-w8pq",
        "discovery": "UNKNOWN"
      },
      "title": "Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-49786",
    "datePublished": "2023-12-14T19:47:46.306Z",
    "dateReserved": "2023-11-30T13:39:50.862Z",
    "dateUpdated": "2025-02-13T17:18:55.224Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.