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CVE-2021-20875

Estado: ModificadaMedia (6.1)—

Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL.

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)

Groupsession — Groupsession

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-20875",
  "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": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "Japan Total System Co.,Ltd.",
          "product": "GroupSession Free edition, GroupSession byCloud, GroupSession ZION",
          "versions": [
            {
              "status": "affected",
              "version": "GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-12-24T07:15:06.747",
  "references": [
    {
      "url": "https://groupsession.jp/info/info-news/security20211220",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN79798166/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://groupsession.jp/info/info-news/security20211220",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN79798166/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de redirección abierta en GroupSession Free edition versiones 5.1.1 y anteriores, GroupSession byCloud versiones 5.1.1 y anteriores, y GroupSession ZION versiones 5.1.1 y anteriores, permite a un atacante remoto no autenticado redirigir a usuarios a sitios web arbitrarios y realizar ataques de phishing haciendo que un usuario acceda a una URL especialmente diseñada"
    }
  ],
  "lastModified": "2026-06-17T03:34:35.557",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:cloud:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D0AB1821-FA7C-41F4-9F3D-D61B778385F9",
              "versionEndIncluding": "5.1.1"
            },
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B51AF142-FBF4-4602-BFD4-DD71D0EB0C3E",
              "versionEndIncluding": "5.1.1"
            },
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4027BB4D-AE22-43B5-A206-94E71D7B6687",
              "versionEndIncluding": "5.1.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}