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CVE-2015-2689

Estado: ModificadaAlta (7.5)—

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

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)

Torproject — TOR

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2015-2689",
  "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": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/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": "security@debian.org",
      "affectedData": [
        {
          "vendor": "The Tor Project",
          "product": "Tor",
          "versions": [
            {
              "status": "affected",
              "version": "before 0.2.4.26"
            },
            {
              "status": "affected",
              "version": "0.2.5.x before 0.2.5.11"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-01-24T18:15:12.317",
  "references": [
    {
      "url": "https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.html",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "security@debian.org"
    },
    {
      "url": "https://trac.torproject.org/projects/tor/ticket/14129",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security@debian.org"
    },
    {
      "url": "https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.html",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://trac.torproject.org/projects/tor/ticket/14129",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets."
    },
    {
      "lang": "es",
      "value": "Tor versiones anteriores a 0.2.4.26 y versiones 0.2.5.x anteriores a 0.2.5.11, no maneja apropiadamente los estados de resolución de conexión pendiente durante los períodos de alta carga DNS, lo que permite a atacantes remotos causar una denegación de servicio (falla de aserción y salida del demonio) por medio de paquetes."
    }
  ],
  "lastModified": "2026-06-17T00:24:33.697",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "55010D56-46F9-4EA3-BD8B-8C29380DEC2F",
              "versionEndExcluding": "0.2.4.26"
            },
            {
              "criteria": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "969C5514-4DB6-4AF4-899C-3AF13C248B80",
              "versionEndExcluding": "0.2.5.11",
              "versionStartIncluding": "0.2.5.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@debian.org"
}