TI-2021-09792 Aliases CVE-2021-28800 GHSA-f7g6-2r8w-qfr2

Command Injection Vulnerability in QTS

MEDIUM 45CWE-78Published 2021-06-24 · Updated 2024-09-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

A command injection vulnerability has been reported to affect QNAP NAS running legacy versions of QTS. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. This issue affects: QNAP Systems Inc. QTS versions prior to 4.3.6.1663 Build 20210504; versions prior to 4.3.3.1624 Build 20210416. This issue does not affect: QNAP Systems Inc. QTS 4.5.3. QNAP Systems Inc. QuTS hero h4.5.3. QNAP Systems Inc. QuTScloud c4.5.5.

Why it matters now

EPSS 0.01433 73rd percentileScored 2026-11-07

Fix Fixed QTS (QNAP Systems Inc.): 4.3.6.1663 Build 20210504, 4.3.3.1624 Build 20210416, 4.5.3QuTS hero (QNAP Systems Inc.): h4.5.3+1 more product

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
QNAP	QTS	before 4.3.6.1663 Build 20210504; before 4.3.3.1624 Build 20210416	4.3.6.1663 Build 20210504, 4.3.3.1624 Build 20210416, 4.5.3	Patch available	CNA
QNAP	QuTS hero	—	h4.5.3	Patch available	CNA
QNAP	QuTScloud	—	c4.5.5	Patch available	CNA

QTS VendorQNAP Affected before 4.3.6.1663 Build 20210504; before 4.3.3.1624 Build 20210416 Fixed in 4.3.6.1663 Build 20210504, 4.3.3.1624 Build 20210416, 4.5.3 Patch available CNA
QuTS hero VendorQNAP Affected — Fixed in h4.5.3 Patch available CNA
QuTScloud VendorQNAP Affected — Fixed in c4.5.5 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:qnap:qts::::::::	before 4.3.3.1624; 4.3.4 to before 4.3.6.1663	Vulnerable	QNAP

cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:* Versions before 4.3.3.1624; 4.3.4 to before 4.3.6.1663 Vulnerable ·QNAP

Remediation

Fix · CNA QTS (QNAP Systems Inc.) Fixed in 4.3.6.1663 Build 20210504, 4.3.3.1624 Build 20210416, 4.5.3
Fix · CNA QuTS hero (QNAP Systems Inc.) Fixed in h4.5.3
Fix · CNA QuTScloud (QNAP Systems Inc.) Fixed in c4.5.5

Timeline

2026-10-02 Threatist record created from CVE-2021-28800
2026-10-03 Alias added: GHSA-f7g6-2r8w-qfr2

References

Advisory 1

https://www.qnap.com/zh-tw/security-advisory/qsa-21-28

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