{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access files within the installation directory via a local HTTP server bound to the loopback interface. By leveraging user interaction with a crafted web page, attackers may retrieve sensitive files such as configuration files, certificates, and logs, leading to information disclosure."
    }
  ],
  "id": "CVE-2021-47960",
  "lastModified": "2026-04-10T10:16:02.853",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security@synology.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-04-10T10:16:02.853",
  "references": [
    {
      "source": "security@synology.com",
      "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
    }
  ],
  "sourceIdentifier": "security@synology.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-552"
        }
      ],
      "source": "security@synology.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2021-47960"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-552"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-10T10:16:02Z",
    "severity": "MODERATE"
  },
  "details": "A files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access files within the installation directory via a local HTTP server bound to the loopback interface. By leveraging user interaction with a crafted web page, attackers may retrieve sensitive files such as configuration files, certificates, and logs, leading to information disclosure.",
  "id": "GHSA-frr3-hpw2-j7cq",
  "modified": "2026-04-10T12:31:44Z",
  "published": "2026-04-10T12:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47960"
    },
    {
      "type": "WEB",
      "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Synology heeft kwetsbaarheden verholpen in Synology SSL VPN Client.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "Een kwaadwillende kan deze kwetsbaarheden misbruiken doordat Synology SSL VPN Client met versie v\u00f3\u00f3r 1.4.5-0684 de PIN-code onveilig opslaat en bestanden via een lokaal HTTP-servercomponent onvoldoende afschermt. Dit kan leiden tot ongeautoriseerde configuratiewijzigingen aan de VPN-client en onderschepping van VPN-verkeer. De kwetsbaarheid be\u00efnvloedt mogelijk de vertrouwelijkheid en integriteit van VPN-sessies.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Synology heeft updates uitgebracht om deze kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Plaintext Storage of a Password",
        "title": "CWE-256"
      },
      {
        "category": "general",
        "text": "Files or Directories Accessible to External Parties",
        "title": "CWE-552"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
      }
    ],
    "title": "Kwetsbaarheden verholpen in Synology SSL VPN Client",
    "tracking": {
      "current_release_date": "2026-04-10T12:11:00.859799Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0109",
      "initial_release_date": "2026-04-10T12:11:00.859799Z",
      "revision_history": [
        {
          "date": "2026-04-10T12:11:00.859799Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "Synology SSL VPN Client"
          }
        ],
        "category": "vendor",
        "name": "Synology"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-47961",
      "cwe": {
        "id": "CWE-256",
        "name": "Plaintext Storage of a Password"
      },
      "notes": [
        {
          "category": "other",
          "text": "Plaintext Storage of a Password",
          "title": "CWE-256"
        },
        {
          "category": "description",
          "text": "A vulnerability in Synology SSL VPN Client before version 1.4.5-0684 allows remote attackers to access or manipulate user PINs due to insecure plaintext password storage, risking unauthorized VPN configuration and traffic interception.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2021-47961 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2021/cve-2021-47961.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2021-47961"
    },
    {
      "cve": "CVE-2021-47960",
      "cwe": {
        "id": "CWE-552",
        "name": "Files or Directories Accessible to External Parties"
      },
      "notes": [
        {
          "category": "other",
          "text": "Files or Directories Accessible to External Parties",
          "title": "CWE-552"
        },
        {
          "category": "description",
          "text": "A vulnerability in Synology SSL VPN Client before version 1.4.5-0684 allows remote attackers to disclose sensitive files via a local HTTP server by tricking users into interacting with malicious web content.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2021-47960 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2021/cve-2021-47960.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2021-47960"
    }
  ]
}