CVE-2021-28800

Command Injection Vulnerability in QTS

CRITICAL
9.8
CVSS Score
Published: June 24, 2021 at 06:20 AM UTC
Updated: June 17, 2026 at 03:46 AM UTC
1 product affected across 1 vendorQTS

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Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.3.3.1624v < 4.3.3.1624 Build 20210416v < 4.3.6.1663 Build 202105044.3.4 ≤ v < 4.3.6.1663
Affected range stops below 4.3.3.1624, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.3.1624 Build 20210416, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.6.1663, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.6.1663 Build 20210504, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 4.5.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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