CVE-2021-38674 Reflected XSS Vulnerability in TFTP

What is CVE-2021-38674?

CVE-2021-38674 is a medium-severity cross-site scripting vulnerability in Qnap Qts, published on 7 Jan 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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

Weakness: CWE-79

Which versions are affected by CVE-2021-38674?

It affects 3 products.

Products include Qnap Qts, Qnap Quts Hero, Qnap Qutscloud.

How do I fix CVE-2021-38674?

No fix has been published for CVE-2021-38674 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-38674 being exploited?

There is no known exploitation of CVE-2021-38674 in the wild and no public exploit code.

Other vulnerabilities in Qnap Qts

• CVE-2020-2509 QNAP Network-Attached Storage (NAS) Command Injection Exploited Critical 9.8
• CVE-2018-19949 QNAP NAS File Station Command Injection Exploited Critical 9.8
• CVE-2019-7193 QNAP QTS Improper Input Validation Exploited Critical 9.8
• CVE-2018-19943 QNAP NAS File Station Cross-Site Scripting Exploited High 8.0
• CVE-2018-19953 QNAP NAS File Station Cross-Site Scripting Exploited Medium 6.1

All Qnap Qts vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6m9q-p58f-wq5w.