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CVE-2008-3806

Status: ModifiedHigh (8.5)—
Severity8.5High · CVSS 2.0
Exploitation probability3.14 %higher than 88% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Cisco IOS 12.0 through 12.4 on Cisco 10000, uBR10012 and uBR7200 series devices handles external UDP packets that are sent to 127.0.0.0/8 addresses intended for IPC communication within the device, which allows remote attackers to cause a denial of service (device or linecard reload) via crafted UDP packets, a different vulnerability than CVE-2008-3805.

CVSS

Base score
8.5
Version
2.0
Vector
AV:N/AC:L/Au:N/C:N/I:P/A:C

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.14 %
Percentile among all scored CVEs
88
Score date
10/22/2026

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 (1)

Cisco — IOS

CWEs

References

Show 10 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2008-3806",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 8.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:C",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 7.8,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "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": "2008-09-26T16:21:44.220",
  "references": [
    {
      "url": "http://secunia.com/advisories/31990",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=16646",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a014ae.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/45592",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7123",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://secunia.com/advisories/31990",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=16646",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a014ae.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/45592",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7123",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cisco IOS 12.0 through 12.4 on Cisco 10000, uBR10012 and uBR7200 series devices handles external UDP packets that are sent to 127.0.0.0/8 addresses intended for IPC communication within the device, which allows remote attackers to cause a denial of service (device or linecard reload) via crafted UDP packets, a different vulnerability than CVE-2008-3805."
    },
    {
      "lang": "es",
      "value": "En Cisco IOS v12.0 a la v12.4 en Cisco 10000, los paquetes externos del UDP del manejador de dispositivos de la serie uBR10012 y uBR7200 que se envían a las direcciones 127.0.0.0 /8 pensados para comunicación IPC dentro del dispositivo, permite que los atacantes remotos causen una denegación del servicio (reinicio del dispositivo o del linecard) a través de paquetes  del UDP manipulados, una vulnerabilidad distinta de CVE-2008-3805."
    }
  ],
  "lastModified": "2026-06-16T22:56:34.617",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            },
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              "vulnerable": true,
              "matchCriteriaId": "2B6B0C2F-2FBE-4422-AD30-305100C595CB"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.0st:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DBEA01D2-B985-4575-AF00-144CE2E3024D"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2sb:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "ADBDC6C0-961B-441D-8C34-AACE0902057E"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2sca:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "140C7C99-1B50-431C-B55C-DFF308E7ECF4"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "8A0DA930-86CE-4D17-BD41-9C4E47D8088F"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2zx:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F9663D24-0D1D-4F46-961F-9D37D3776E90"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.3bc:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "40183EF8-BD19-49AD-9E55-7FCCA635327F"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "C0C3B413-76F7-413B-A51F-29834F9DE722"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.3xi:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AA212293-7BAF-4AD9-BD30-E953CBA7CB95"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "9D4D8C72-E7BB-40BF-9AE5-622794D63E09"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}