CVE-2021-44053

Name: CVE-2021-44053
Creator: NVD / NIST
Published: 2022-05-05T17:15:10.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2021-44053 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running QTS, QuTS hero and QuTScloud. If exploited, this vulnerability allows remote attackers to inject malicious code. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running 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: QTS 4.5.4.1991 build 20220329 and later QTS 5.0.0.1986 build 20220324 and later QuTS hero h5.0.0.1986 build 20220324 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTScloud c5.0.1.1949 and later

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.69%

48.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Qnap	Qts	>= 5.0.0.1716, < 5.0.0.1986	—
Qnap	Qts	>= 4.3.3.0174, < 4.3.3.1945	—
Qnap	Qts	>= 4.3.4.0899, < 4.3.4.1976	—
Qnap	Qts	>= 4.3.6.0895, < 4.3.6.1965	—
Qnap	Qts	>= 4.4.0.0883, < 4.5.4.1991	—
Qnap	Qts	4.2.6	Build 20170517
Qnap	Quts Hero	< h4.5.4.1771	—
Qnap	Quts Hero	>= h5.0.0.1772, < h5.0.0.1986	—
Qnap	Qutscloud	< c5.0.1.1998	—

References

https://www.qnap.com/en/security-advisory/qsa-22-16Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-22-16Vendor Advisory

Timeline

Published: May 5, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44053?

How severe is CVE-2021-44053?

CVE-2021-44053 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44053?

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-2021-44053?

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

Scan your code now

Source: NVD / NIST