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CVE-2021-44425

Status: ModifiedMedium (6.5)—

An issue was discovered in AnyDesk before 6.2.6 and 6.3.x before 6.3.3. An unnecessarily open listening port on a machine in the LAN of an attacker, opened by the Anydesk Windows client when using the tunneling feature, allows the attacker unauthorized access to the local machine's AnyDesk tunneling protocol stack (and also to any remote destination machine software that is listening to the AnyDesk tunneled port).

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)

Anydesk — Anydesk

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-44425",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-09-12T21:15:09.070",
  "references": [
    {
      "url": "https://anydesk.com/en/downloads/windows",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://argus-sec.com/discovering-tunneling-service-security-flaws-in-anydesk-remote-application/",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://anydesk.com/en/downloads/windows",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://argus-sec.com/discovering-tunneling-service-security-flaws-in-anydesk-remote-application/",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in AnyDesk before 6.2.6 and 6.3.x before 6.3.3. An unnecessarily open listening port on a machine in the LAN of an attacker, opened by the Anydesk Windows client when using the tunneling feature, allows the attacker unauthorized access to the local machine's AnyDesk tunneling protocol stack (and also to any remote destination machine software that is listening to the AnyDesk tunneled port)."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en AnyDesk versiones anteriores a 6.2.6 y en versiones 6.3.x anteriores a 6.3.3. Un puerto de escucha innecesariamente abierto en una máquina en la LAN de un atacante, abierto por el cliente de Windows de AnyDesk cuando es usada la funcionalidad tunneling, permite al atacante acceder sin autorización a la pila de protocolos de tunelización de AnyDesk de la máquina local (y también a cualquier software de la máquina de destino remota que esté escuchando el puerto tunelizado de AnyDesk)"
    }
  ],
  "lastModified": "2026-06-17T04:12:19.593",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:anydesk:anydesk:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C5CA60F4-25B6-44E9-997F-AD1CF9C7B34C",
              "versionEndExcluding": "6.2.6"
            },
            {
              "criteria": "cpe:2.3:a:anydesk:anydesk:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C55E8126-92A0-4739-BB65-5F72B771EA58",
              "versionEndExcluding": "6.3.3",
              "versionStartIncluding": "6.3.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}