CVE-2021-38674

Reflected XSS Vulnerability in TFTP

Description

A cross-site scripting (XSS) vulnerability has been reported to affect 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: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later

Remediation

Solution:

  • We have already fixed this vulnerability in the following versions of QuTS hero, QTS, QuTScloud: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later

Category

4.2
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.19%
Vendor Advisory qnap.com
Affected: QNAP Systems Inc. QuTS hero
Affected: QNAP Systems Inc. QTS
Affected: QNAP Systems Inc. QuTScloud
Published at:
Updated at:

References

Link Tags
https://www.qnap.com/en/security-advisory/qsa-21-63 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-38674?
CVE-2021-38674 has been scored as a medium severity vulnerability.
How to fix CVE-2021-38674?
To fix CVE-2021-38674: We have already fixed this vulnerability in the following versions of QuTS hero, QTS, QuTScloud: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later
Is CVE-2021-38674 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-38674 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-38674?
CVE-2021-38674 affects QNAP Systems Inc. QuTS hero, QNAP Systems Inc. QTS, QNAP Systems Inc. QuTScloud.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.