CVE-2021-38685: Command Injection Vulnerability in VioStor

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-26 · updated 2026-06-17
Weakness: CWE-78

Description

A command injection vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later

Affected products

QNAP Systems Inc. QVR: before 5.1.6 — fixed in 5.1.6

How to fix

Upgrade to a fixed version: QNAP Systems Inc. QVR 5.1.6. Check the vendor advisory for mitigations.

References

https://www.qnap.com/en/security-advisory/qsa-21-51
https://www.qnap.com/en/security-advisory/qsa-21-51

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