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CVE-2021-28814

Status: ModifiedHigh (8.8)—

An improper access control vulnerability has been reported to affect QNAP NAS. If exploited, this vulnerability allows remote attackers to compromise the security of the software. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.4.

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)

Qnap — Helpdesk

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-28814",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@qnapsecurity.com.tw",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@qnapsecurity.com.tw",
      "affectedData": [
        {
          "vendor": "QNAP Systems Inc.",
          "product": "Helpdesk",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "3.0.4",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-11T07:15:06.657",
  "references": [
    {
      "url": "https://www.qnap.com/zh-tw/security-advisory/qsa-21-25",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@qnapsecurity.com.tw"
    },
    {
      "url": "https://www.qnap.com/zh-tw/security-advisory/qsa-21-25",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@qnapsecurity.com.tw",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An improper access control vulnerability has been reported to affect QNAP NAS. If exploited, this vulnerability allows remote attackers to compromise the security of the software. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.4."
    },
    {
      "lang": "es",
      "value": "Se ha reportado una vulnerabilidad de control de acceso inapropiado  que afecta a QNAP NAS. Si es explotada, esta vulnerabilidad permite a atacantes remotos comprometer la seguridad del software. Este problema afecta: QNAP Systems Inc. versiones anteriores a 3.0.4"
    }
  ],
  "lastModified": "2026-06-17T03:46:54.800",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:qnap:helpdesk:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "44688E7A-E038-492C-BAF9-5A2F25CD4B0A",
              "versionEndExcluding": "3.0.4"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@qnapsecurity.com.tw"
}