CVE-2020-2509: QNAP Network-Attached Storage (NAS) Command Injection Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-04-11. EPSS: 34% chance of exploitation in the next 30 days.

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

Affected products

• QNAP QTS: before 4.2.6 (fixed in 4.2.6); from 4.3.5, before 4.3.6 (fixed in 4.3.6); from 4.4.0, before 4.5.1 (fixed in 4.5.1); version 4.2.6 only; version 4.3.3.0174 only; version 4.3.3.0868 only; …
• QNAP Quts Hero: before h4.5.1 (fixed in h4.5.1); version h4.5.1 only; version h4.5.1.1472 only

Published 2021-04-17. Last modified 2026-06-17.