CVE-2024-21899: QNAP QTS

Critical severity, CVSS 9.8. EPSS: 24.4% chance of exploitation in the next 30 days.

An improper authentication vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QTS 4.5.4.2627 build 20231225 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTS hero h4.5.4.2626 build 20231225 and later QuTScloud c5.1.5.2651 and later

Affected products

• QNAP QTS: before 4.5.4.2627 (fixed in 4.5.4.2627); from 5.1.0, before 5.1.3.2578 (fixed in 5.1.3.2578); version 4.5.4.2627 only; version 5.1.3.2578 only
• QNAP Quts Hero: before h4.5.4.2626 (fixed in h4.5.4.2626); from h5.1.0, before h5.1.3.2578 (fixed in h5.1.3.2578); version h4.5.4.2626 only; version h5.1.3.2578 only
• QNAP Qutscloud: before c5.1.5.2651 (fixed in c5.1.5.2651)

Published 2024-03-08. Last modified 2026-06-17.