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CVE-2014-3347

Status: ModifiedMedium (5.4)—

Cisco IOS 15.1(4)M2 on Cisco 1800 ISR devices, when the ISDN Basic Rate Interface is enabled, allows remote attackers to cause a denial of service (device hang) by leveraging knowledge of the ISDN phone number to trigger an interrupt timer collision during entropy collection, leading to an invalid state of the hardware encryption module, aka Bug ID CSCul77897.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (8)

Cisco — 1801 Integrated Service RouterCisco — 1802 Integrated Service RouterCisco — 1803 Integrated Service RouterCisco — 1811 Integrated Service RouterCisco — 1812 Integrated Service RouterCisco — 1841 Integrated Service RouterCisco — 1861 Integrated Service RouterCisco — IOS

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2014-3347",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2014-08-28T23:55:05.513",
  "references": [
    {
      "url": "http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=35453",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/69439",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securitytracker.com/id/1030772",
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/95558",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=35453",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/69439",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id/1030772",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/95558",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cisco IOS 15.1(4)M2 on Cisco 1800 ISR devices, when the ISDN Basic Rate Interface is enabled, allows remote attackers to cause a denial of service (device hang) by leveraging knowledge of the ISDN phone number to trigger an interrupt timer collision during entropy collection, leading to an invalid state of the hardware encryption module, aka Bug ID CSCul77897."
    },
    {
      "lang": "es",
      "value": "Cisco IOS 15.1(4)M2 en los dispositivos Cisco 1800 ISR, cuando la interfaz ISDN Basic Rate está habilitada, permite a atacantes remotos causar una denegación de servicio (cuelgue del dispositivo) mediante el aprovechamiento del conocimiento del número de teléfono ISDN para provocar una colisión de interrumpir el temporizador durante la colección de entropía, que lleva a un estado inválido del módulo de la codificación de hardware, también conocido como Bug ID CSCul77897."
    }
  ],
  "lastModified": "2026-06-17T00:08:01.690",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1\\(4\\)m2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6777AC09-8BA9-4595-89C2-1EAD0310B78B"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:cisco:1801_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D5E48D7-2266-4649-90A9-62C476AFE6DE"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1802_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "99581637-E184-4A02-8313-57C7C31E5479"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1803_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9C6D4A90-31B9-4B6C-ADAC-44C49DB44115"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1811_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B3AF3F75-0BD8-4AA6-B696-3624BEE86681"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1812_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6C58CEA6-69F8-4021-98C9-4676C70AB167"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1841_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DF156D97-7C39-49CF-9938-D9681066FF05"
            },
            {
              "criteria": "cpe:2.3:h:cisco:1861_integrated_service_router:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "459FEB4E-54E3-4FE5-82A5-6E4ECE855DD6"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}