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CVE-2006-4650

Status: ModifiedLow (2.6)—
Severity2.6Low · CVSS 2.0
Exploitation probability3.23 %higher than 88% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance fixes are missing, does not verify the offset field of a GRE packet during decapsulation, which leads to an integer overflow that references data from incorrect memory locations, which allows remote attackers to inject crafted packets into the routing queue, possibly bypassing intended router ACLs.

CVSS

Base score
2.6
Version
2.0
Vector
AV:N/AC:H/Au:N/C:P/I:N/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.23 %
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 22 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2006-4650",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2006-09-09T00:04:00.000",
  "references": [
    {
      "url": "http://secunia.com/advisories/21783",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://securityreason.com/securityalert/1526",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://securitytracker.com/id?1016799",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.osvdb.org/28590",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.phenoelit.de/stuff/CiscoGRE.txt",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/445322/100/0/threaded",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/19878",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2006/3502",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/28786",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/21783",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securityreason.com/securityalert/1526",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securitytracker.com/id?1016799",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.osvdb.org/28590",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.phenoelit.de/stuff/CiscoGRE.txt",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/445322/100/0/threaded",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/19878",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2006/3502",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/28786",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance fixes are missing, does not verify the offset field of a GRE packet during decapsulation, which leads to an integer overflow that references data from incorrect memory locations, which allows remote attackers to inject crafted packets into the routing queue, possibly bypassing intended router ACLs."
    },
    {
      "lang": "es",
      "value": "Cisco IOS 12.0, 12.1, y 12.2, cuando la tunelación GRE IP esta siendo usada y falta la conformidad RFC2784, no verifica el campo offset de un paquete GRE durante su encapsulación, lo cauls lleva a un desbordamiento de enteros que referencia datos desde localizaciones de memoria incorrectas, lo cual permite a un atacante remoto inyectar paquetes artesanales dentro de la cola de enrutamiento, posiblemente evitando la ACLs del router previsto."
    }
  ],
  "lastModified": "2026-06-16T22:29:31.427",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8F86F790-6247-42F2-9487-3D60A2842F52"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1F2F9EC5-EDA2-4C99-BBF1-2F2C92AACE95"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E4BC49F2-3DCB-45F0-9030-13F6415EE178"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}