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CVE-2016-9937

Estado: ModificadaAlta (7.5)—

An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. This occurs as the code does not properly handle spaces separating the parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in chan_pjsip an SDP offer or answer is still processed and the crash occurs.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Digium — Asterisk

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2016-9937",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": true,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2016-12-12T21:59:00.303",
  "references": [
    {
      "url": "http://downloads.asterisk.org/pub/security/AST-2016-008-13.diff",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
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    {
      "url": "http://downloads.asterisk.org/pub/security/AST-2016-008-14.diff",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
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      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/94792",
      "tags": [
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        "VDB Entry"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1037407",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://issues.asterisk.org/jira/browse/ASTERISK-26579",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://downloads.asterisk.org/pub/security/AST-2016-008-13.diff",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://downloads.asterisk.org/pub/security/AST-2016-008-14.diff",
      "tags": [
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        "Vendor Advisory"
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    },
    {
      "url": "http://downloads.asterisk.org/pub/security/AST-2016-008.html",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/94792",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id/1037407",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://issues.asterisk.org/jira/browse/ASTERISK-26579",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. This occurs as the code does not properly handle spaces separating the parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in chan_pjsip an SDP offer or answer is still processed and the crash occurs."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en Asterisk Open Source 13.12.x y 13.13.x en versiones anteriores 13.13.1 y 14.x en versiones anteriores 14.2.1. Si se recibe una prueba o respuesta SDP con el codec Opus y con los parámetros de formato separados usando un espacio de código responsable de análisis llamará a si mismo de forma recursiva hasta que se bloquee. Esto ocurre cuando el código no maneja adecuadamente los espacios que separan los parámetros. Esto NO requiere que el punto final tenga Opus configurado en Asterisk. Esto tampoco requiere que el punto final esté autenticado. Si el invitado está habilitado para chan_sip o anónimo en chan_pjsip una prueba o respuesta SDP se sigue procesando y se produce el bloqueo."
    }
  ],
  "lastModified": "2026-06-17T00:56:48.557",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:digium:asterisk:13.12:*:*:*:*:*:*:*",
              "vulnerable": true,
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            },
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              "vulnerable": true,
              "matchCriteriaId": "86B16D04-3808-4380-8F64-0C36B185C1F2"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:14.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C949D5F5-6C0B-4B17-85B6-3A77D08CF967"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:14.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C039C0CE-9C9C-4D85-8D7C-574DCF9D920B"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:14.01:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A1B2F2CC-18C3-46E7-8E7F-970622A710C9"
            },
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              "criteria": "cpe:2.3:a:digium:asterisk:14.1.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D2C4DA60-5701-4BD0-B2F9-D93B9E64111F"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:14.1.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0B12834D-2AF1-4AD1-AB23-859CAA5D3210"
            },
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              "matchCriteriaId": "89036D04-EA04-4041-9694-6768478D35F3"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "B19070D3-9F03-43C7-9F31-9A54BD5F2441"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}