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CVE-2011-0935

Status: ModifiedHigh (10)—
Severity10High · CVSS 2.0
Exploitation probability3.99 %higher than 90% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The PKI functionality in Cisco IOS 15.0 and 15.1 does not prevent permanent caching of certain public keys, which allows remote attackers to bypass authentication and have unspecified other impact by leveraging an IKE peer relationship in which a key was previously valid but later revoked, aka Bug ID CSCth82164, a different vulnerability than CVE-2010-4685.

CVSS

Base score
10
Version
2.0
Vector
AV:N/AC:L/Au:N/C:C/I:C/A:C

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.99 %
Percentile among all scored CVEs
90
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 (1)

Cisco — IOS

CWEs

References

Show 6 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-0935",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "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": "2011-04-14T16:55:01.317",
  "references": [
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-2TCAVS.html",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_1s/release/notes/15_1s_caveats_15_1_1s.html",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/47407",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-2TCAVS.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_1s/release/notes/15_1s_caveats_15_1_1s.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/47407",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-310"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The PKI functionality in Cisco IOS 15.0 and 15.1 does not prevent permanent caching of certain public keys, which allows remote attackers to bypass authentication and have unspecified other impact by leveraging an IKE peer relationship in which a key was previously valid but later revoked, aka Bug ID CSCth82164, a different vulnerability than CVE-2010-4685."
    },
    {
      "lang": "es",
      "value": "La funcionalidad de PKI en Cisco IOS v15.0 y v15.1 no impide el almacenamiento en caché permanente de ciertas claves públicas, lo que permite evitar la autenticación a atacantes remotos y tener otros impactos no especificados mediante el aprovechamiento de una relación IKE en el que una clave que ha sido válida es posteriormente revocada. Vulnerabilidad también conocida como Bug ID CSCth82164. Se trata de una vulnerabilidad diferente a CVE-2010-4685.\r\n"
    }
  ],
  "lastModified": "2026-06-16T23:28:19.753",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CF87CC9A-1AF5-4DB4-ACE5-DB938D3B2F84"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EB41294E-F3DF-4F1E-A4C8-E90B21A88836"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "evaluatorImpact": "CVSS score derived from:\r\n\r\nhttp://www.cisco.com/en/US/docs/ios/15_1s/release/notes/15_1s_caveats_15_1_2s.html",
  "sourceIdentifier": "psirt@cisco.com"
}