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CVE-2015-2694

Status: ModifiedMedium (5.8)—

The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.

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 (1)

MIT — Kerberos 5

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2015-2694",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "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": "2015-05-25T19:59:02.407",
  "references": [
    {
      "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/74824",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.ubuntu.com/usn/USN-2810-1",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/krb5/krb5/commit/e3b5a5e5267818c97750b266df50b6a3d4649604",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/74824",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.ubuntu.com/usn/USN-2810-1",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/krb5/krb5/commit/e3b5a5e5267818c97750b266df50b6a3d4649604",
      "tags": [
        "Vendor Advisory"
      ],
      "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 kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c."
    },
    {
      "lang": "es",
      "value": "Los módulos kdcpreauth en MIT Kerberos 5 (también conocido como krb5) 1.12.x y 1.13.x anterior a 1.13.2 no rastrea correctamente si la solicitud de un cliente ha sido validada, lo que permite a atacantes remotos evadir un requisito de preautenticación mediante la provisión de (1) cero bytes de datos o (2) un nombre de ámbito (realm) arbitrario, relacionado con plugins/preauth/otp/main.c y plugins/preauth/pkinit/pkinit_srv.c."
    }
  ],
  "lastModified": "2026-06-17T00:24:34.020",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.12:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "79A9FAE9-7219-4D6A-9E94-FFE20223537D"
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.12.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EA68BC90-FCFC-4C9B-8574-9029DB2358E9"
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.12.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9D0A28CB-173D-4676-B083-E3718213B840"
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.12.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AA3D2861-7EB7-4984-AC92-989B427BDB58"
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "169D00BD-344F-453C-BE7C-9DF0740080BB"
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "765B3248-A524-4A79-858C-E787C1C1599E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}