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CVE-2011-0963

Status: ModifiedMedium (5)—
Severity5Medium · CVSS 2.0
Exploitation probability1.80 %higher than 78% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The default configuration of the RADIUS authentication feature on the Cisco Network Admission Control (NAC) Guest Server with software before 2.0.3 allows remote attackers to bypass intended access restrictions and obtain network connectivity via unspecified vectors, aka Bug ID CSCtj66922.

CVSS

Base score
5
Version
2.0
Vector
AV:N/AC:L/Au:N/C:P/I:N/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.80 %
Percentile among all scored CVEs
78
Score date
10/21/2026

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 (2)

Cisco — NAC Guest ServerCisco — NAC Guest Server Software

CWEs

References

Show 4 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-0963",
  "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:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "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": "2011-03-31T22:55:02.973",
  "references": [
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b74114.shtml",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securitytracker.com/id?1025272",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b74114.shtml",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id?1025272",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-264"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The default configuration of the RADIUS authentication feature on the Cisco Network Admission Control (NAC) Guest Server with software before 2.0.3 allows remote attackers to bypass intended access restrictions and obtain network connectivity via unspecified vectors, aka Bug ID CSCtj66922."
    },
    {
      "lang": "es",
      "value": "La configuración por defecto de la funcionalidad de autenticación RADIUS en el Cisco Network Admission Control (NAC) Guest Server con software en versiones anteriores a 2.0.3 permite a atacantes remotos eludir las restricciones destinadas al acceso y obtener conectividad de red a través de vectores no especificados, vulnerabilidad también conocida como Bug ID CSCtj66922."
    }
  ],
  "lastModified": "2026-06-16T23:28:21.113",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:cisco:nac_guest_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0948BDF8-94FA-4911-907A-6D0B1A820472"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "495B5D55-0941-451B-998E-41E6FEC17E16",
              "versionEndIncluding": "2.0.2"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:1.0.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AFC043FE-B7C8-416A-985D-18C2FC59E780"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:1.1.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5587EBF9-CB6E-4429-BC1A-E029657160E7"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:1.1.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7297C9B5-E37E-48A6-B5FB-87EEBF25EC63"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "A9C63282-A4E2-4BC4-93B8-B2CBF3ABE4C8"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:1.1.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DAE1F91B-37A0-4992-AE23-1E0473243F3C"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:2.0.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E06B4395-92AA-4DE3-B4B5-D48843BF850B"
            },
            {
              "criteria": "cpe:2.3:a:cisco:nac_guest_server_software:2.0.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "294DCA83-6F8F-4381-85DD-0C1FF66537A8"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}