What’s Vulnerable › Vulnerabilities

CVE-2021-38686: Improper Authentication Vulnerability in VioStor

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% 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-287

Description

An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. 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-21-52
• https://www.qnap.com/en/security-advisory/qsa-21-52

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