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CVE-2021-38674

Status: ModifiedMedium (6.1)—

A cross-site scripting (XSS) vulnerability has been reported to affect QTS, QuTS hero and QuTScloud. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QTS, QuTS hero and QuTScloud: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later

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 (3)

Qnap — QTSQnap — Quts HeroQnap — Qutscloud

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-38674",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@qnapsecurity.com.tw",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.2,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 1.6
      },
      {
        "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": "security@qnapsecurity.com.tw",
      "affectedData": [
        {
          "vendor": "QNAP Systems Inc.",
          "product": "QuTS hero",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "h4.5.4.1771 build 20210825",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "QNAP Systems Inc.",
          "product": "QTS",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "4.5.4.1787 build 20210910",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "QNAP Systems Inc.",
          "product": "QuTScloud",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "c4.5.7.1864",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-01-07T02:15:07.143",
  "references": [
    {
      "url": "https://www.qnap.com/en/security-advisory/qsa-21-63",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@qnapsecurity.com.tw"
    },
    {
      "url": "https://www.qnap.com/en/security-advisory/qsa-21-63",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@qnapsecurity.com.tw",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A cross-site scripting (XSS) vulnerability has been reported to affect QTS, QuTS hero and QuTScloud. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QTS, QuTS hero and QuTScloud: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later"
    },
    {
      "lang": "es",
      "value": "Se ha informado de una vulnerabilidad de tipo cross-site scripting (XSS) que afecta a QTS, QuTS hero y QuTScloud. Si es explotado, esta vulnerabilidad permite a atacantes remotos inyectar código malicioso. Ya hemos corregido esta vulnerabilidad en las siguientes versiones de QTS, QuTS hero y QuTScloud: QuTS hero h4.5.4.1771 build 20210825 y posteriores QTS 4.5.4.1787 build 20210910 y posteriores QuTScloud c4.5.7.1864 y posteriores"
    }
  ],
  "lastModified": "2026-06-17T04:02:34.140",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D1A3D4EA-E5ED-45B7-98EE-56D49D14B95C",
              "versionEndExcluding": "4.5.4.1787"
            },
            {
              "criteria": "cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2B57DE98-C9C6-4C4D-B790-293D6D0CE646",
              "versionEndExcluding": "h4.5.4.1771"
            },
            {
              "criteria": "cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6B67BDC9-81F2-448E-9DE7-FF94CF46A670",
              "versionEndExcluding": "c4.5.7.1864"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@qnapsecurity.com.tw"
}