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TI-2021-09798 Aliases CVE-2021-28806GHSA-q3xx-v678-8w29

DOM-Based XSS Vulnerability in QTS and QuTS hero

Priority LOW 26CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

A DOM-based XSS vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to inject malicious code. This issue affects: QNAP Systems Inc. QTS versions prior to 4.5.3.1652 Build 20210428. QNAP Systems Inc. QuTS hero versions prior to h4.5.2.1638 Build 20210414. QNAP Systems Inc. QuTScloud versions prior to c4.5.5.1656 Build 20210503. This issue does not affect: QNAP Systems Inc. QTS 4.3.6; 4.3.3.

Why it matters now

EPSS 0.00505 43rd percentileScored 2026-11-07
Fix Fixed QTS (QNAP Systems Inc.): 4.5.3.1652 Build 20210428, 4.3.6, 4.3.3QuTS hero (QNAP Systems Inc.): h4.5.2.1638 Build 20210414+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
QNAPQTSbefore 4.5.3.1652 Build 202104284.5.3.1652 Build 20210428, 4.3.6, 4.3.3Patch availableCNA
QNAPQuTS herobefore h4.5.2.1638 Build 20210414h4.5.2.1638 Build 20210414Patch availableCNA
QNAPQuTScloudbefore c4.5.5.1656 Build 20210503c4.5.5.1656 Build 20210503Patch availableCNA
  • QTS VendorQNAP Affected before 4.5.3.1652 Build 20210428 Fixed in 4.5.3.1652 Build 20210428, 4.3.6, 4.3.3 Patch available CNA
  • QuTS hero VendorQNAP Affected before h4.5.2.1638 Build 20210414 Fixed in h4.5.2.1638 Build 20210414 Patch available CNA
  • QuTScloud VendorQNAP Affected before c4.5.5.1656 Build 20210503 Fixed in c4.5.5.1656 Build 20210503 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*before 4.5.3.1652VulnerableQNAP
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*before h4.5.2.1638VulnerableQNAP
cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*before c4.5.5.1656VulnerableQNAP
  • cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:* Versions before 4.5.3.1652 Vulnerable ·QNAP
  • cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:* Versions before h4.5.2.1638 Vulnerable ·QNAP
  • cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:* Versions before c4.5.5.1656 Vulnerable ·QNAP

Remediation

  • Fix · CNA QTS (QNAP Systems Inc.) Fixed in 4.5.3.1652 Build 20210428, 4.3.6, 4.3.3
  • Fix · CNA QuTS hero (QNAP Systems Inc.) Fixed in h4.5.2.1638 Build 20210414
  • Fix · CNA QuTScloud (QNAP Systems Inc.) Fixed in c4.5.5.1656 Build 20210503

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28806
  2. 2026-10-03 Alias added: GHSA-q3xx-v678-8w29

References

Advisory 1

  • TI-2020-02221 Command Injection Vulnerability in QTS and QuTS hero KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05101 Improper input validation in QNAP NAS devices KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-14137 Improper input validation in QNAP QTS KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-14131 Cross-site scripting in QNAP QTS KEVCVSS 3.1HIGH 8.0
See all 282 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences