CVE-2021-38686

Improper Authentication Vulnerability in VioStor

HIGH

8.8

CVSS Score

Published: November 26, 2021 at 02:00 PM UTC

Updated: June 17, 2026 at 04:02 AM UTC

1 product affected across 1 vendorQVR

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Severity

HIGH8.8

Exploit prediction

EPSS 1.0%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

QVR · Qnap

95%

v < 5.1.6v < QVR FW 5.1.6 build 20211109

Affected range stops below 5.1.6, so it looks safe — our inference, not a vendor statement

Affected range stops below QVR FW 5.1.6 build 20211109, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.qnap.com/en/security-advisory/qsa-21-52

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.qnap.com/en/security-advisory/qsa-21-52

CVSS

8.8HIGHqnap

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287

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