Vulnerability-Lookup

CERTFR-2026-AVI-0431

Vulnerability from certfr_avis - Published: 2026-04-14 - Updated: 2026-04-14

De multiples vulnérabilités ont été découvertes dans Synology SSL VPN Client. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Synology	SSL VPN Client	Synology SSL VPN Client versions antérieures à 1.4.5-0684

References

Title

Publication Time

Tags

Bulletin de sécurité Synology Synology_SA_26_05

2026-04-10

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Synology SSL VPN Client versions ant\u00e9rieures \u00e0 1.4.5-0684",
      "product": {
        "name": "SSL VPN Client",
        "vendor": {
          "name": "Synology",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2021-47960",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-47960"
    },
    {
      "name": "CVE-2021-47961",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-47961"
    }
  ],
  "initial_release_date": "2026-04-14T00:00:00",
  "last_revision_date": "2026-04-14T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0431",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-04-14T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
    },
    {
      "description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Synology SSL VPN Client. Elles permettent \u00e0 un attaquant de provoquer une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et une atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Synology SSL VPN Client",
  "vendor_advisories": [
    {
      "published_at": "2026-04-10",
      "title": "Bulletin de s\u00e9curit\u00e9 Synology Synology_SA_26_05",
      "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
    }
  ]
}

CVE-2021-47960 (GCVE-0-2021-47960)

Vulnerability from cvelistv5 – Published: 2026-04-10 09:21 – Updated: 2026-04-10 12:43

Summary

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.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CWE

CWE-552 - Files or Directories Accessible to External Parties

Assigner

synology

References

URL

Tags

https://www.synology.com/en-global/security/advis…

vendor-advisory

Impacted products

	Vendor	Product	Version
	Synology	Synology SSL VPN Client	Affected: * , < 1.4.5-0684 (semver)

Credits

Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47960",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T12:43:26.407315Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-10T12:43:33.313Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Synology SSL VPN Client",
          "vendor": "Synology",
          "versions": [
            {
              "lessThan": "1.4.5-0684",
              "status": "affected",
              "version": "*",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)"
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-552",
              "description": "Files or Directories Accessible to External Parties",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-10T09:21:54.559Z",
        "orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
        "shortName": "synology"
      },
      "references": [
        {
          "name": "Synology-SA-26:05 Synology SSL VPN Client",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
    "assignerShortName": "synology",
    "cveId": "CVE-2021-47960",
    "datePublished": "2026-04-10T09:21:54.559Z",
    "dateReserved": "2026-04-10T06:29:38.695Z",
    "dateUpdated": "2026-04-10T12:43:33.313Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2021-47961 (GCVE-0-2021-47961)

Vulnerability from cvelistv5 – Published: 2026-04-10 09:22 – Updated: 2026-04-10 12:42

Summary

A plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user's PIN code due to insecure storage. This may lead to unauthorized VPN configuration and potential interception of subsequent VPN traffic when combined with user interaction.

Severity ?

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE

CWE-256 - Plaintext Storage of a Password

Assigner

synology

References

URL

Tags

https://www.synology.com/en-global/security/advis…

vendor-advisory

Impacted products

	Vendor	Product	Version
	Synology	Synology SSL VPN Client	Affected: * , < 1.4.5-0684 (semver)

Credits

Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47961",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T12:42:50.035627Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-10T12:42:56.656Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Synology SSL VPN Client",
          "vendor": "Synology",
          "versions": [
            {
              "lessThan": "1.4.5-0684",
              "status": "affected",
              "version": "*",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user\u0027s PIN code due to insecure storage. This may lead to unauthorized VPN configuration and potential interception of subsequent VPN traffic when combined with user interaction."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-256",
              "description": "Plaintext Storage of a Password",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-10T09:22:37.522Z",
        "orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
        "shortName": "synology"
      },
      "references": [
        {
          "name": "Synology-SA-26:05 Synology SSL VPN Client",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_05"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01",
    "assignerShortName": "synology",
    "cveId": "CVE-2021-47961",
    "datePublished": "2026-04-10T09:22:37.522Z",
    "dateReserved": "2026-04-10T06:29:38.695Z",
    "dateUpdated": "2026-04-10T12:42:56.656Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CERTFR-2026-AVI-0431

Solutions

CVE-2021-47960 (GCVE-0-2021-47960)

CVE-2021-47961 (GCVE-0-2021-47961)

Tags

Sightings

Nomenclature