CVE-2021-44053: QNAP QTS

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• QNAP QTS: from 5.0.0.1716, before 5.0.0.1986 (fixed in 5.0.0.1986); from 4.3.3.0174, before 4.3.3.1945 (fixed in 4.3.3.1945); from 4.3.4.0899, before 4.3.4.1976 (fixed in 4.3.4.1976); from 4.3.6.0895, before 4.3.6.1965 (fixed in 4.3.6.1965); from 4.4.0.0883, before 4.5.4.1991 (fixed in 4.5.4.1991); version 4.2.6 only
• QNAP Quts Hero: before h4.5.4.1771 (fixed in h4.5.4.1771); from h5.0.0.1772, before h5.0.0.1986 (fixed in h5.0.0.1986)
• QNAP Qutscloud: before c5.0.1.1998 (fixed in c5.0.1.1998)

Published 2022-05-05. Last modified 2026-06-17.