CVE-2021-28804

Name: CVE-2021-28804
Creator: NVD / NIST
Published: 2021-07-01T02:15:07.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.82%

Last modified Jun 17, 2026

CVE-2021-28804 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A command injection vulnerabilities have been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. EPSS estimates a 1.82% chance of exploitation in the next 30 days.

Description

A command injection vulnerabilities have been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. This issue affects: QNAP Systems Inc. QTS versions prior to 4.5.1.1540 build 20210107. QNAP Systems Inc. QuTS hero versions prior to h4.5.1.1582 build 20210217.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.82%

75.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Qnap	Qts	<= 4.5.1.1540
Qnap	Quts Hero	<= h4.5.1.1582

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-29Vendor Advisory
https://www.qnap.com/zh-tw/security-advisory/qsa-21-29Vendor Advisory

Timeline

Published: Jul 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28804?

How severe is CVE-2021-28804?

CVE-2021-28804 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28804?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28804?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST