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CVE-2021-21673

Estado: ModificadaMedia (6.1)—

Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Jenkins — CAS

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21673",
  "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": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "jenkinsci-cert@googlegroups.com",
      "affectedData": [
        {
          "vendor": "Jenkins project",
          "product": "Jenkins CAS Plugin",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "1.6.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-30T17:15:09.160",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2021/06/30/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "jenkinsci-cert@googlegroups.com"
    },
    {
      "url": "https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "jenkinsci-cert@googlegroups.com"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2021/06/30/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "descriptions": [
    {
      "lang": "en",
      "value": "Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks."
    },
    {
      "lang": "es",
      "value": "Jenkins CAS Plugin versiones 1.6.0 y anteriores determina inapropiadamente que una URL de redireccionamiento después del inicio de sesión está apuntando legítimamente a Jenkins, permitiendo a atacantes llevar a cabo ataques de phishing"
    }
  ],
  "lastModified": "2026-06-17T03:35:58.460",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:jenkins:cas:*:*:*:*:*:jenkins:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9F3E362D-3518-4D3B-9815-A2AAF7899231",
              "versionEndIncluding": "1.6.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "jenkinsci-cert@googlegroups.com"
}