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CVE-2016-6515

Estado: ModificadaAlta (7.5)—💥 Exploit

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (2)

Fedoraproject — FedoraOpenbsd — Openssh

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2016-6515",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
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          "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",
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          "versions": [
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              "status": "affected",
              "version": "n/a"
            }
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  ],
  "published": "2016-08-07T21:59:09.943",
  "references": [
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      "url": "http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html",
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    {
      "url": "http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html",
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      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf",
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string."
    },
    {
      "lang": "es",
      "value": "La función auth_password en auth-passwd.c en sshd en OpenSSH en versiones anteriores a 7.3 no limita longitudes de contraseña para autenticación de contraseña, lo que permite a atacantes remotos provocar una denegación de servicio (consumo de CPU clave) a través de una cadena larga."
    }
  ],
  "lastModified": "2026-06-17T00:51:18.350",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "4AFA4267-E15B-4826-9B98-63F68AB1627F",
              "versionEndIncluding": "7.2"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
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            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}