CVE-2021-38685

Name: CVE-2021-38685
Creator: NVD / NIST
Published: 2021-11-26T14:15:07.713+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.47%

Last modified Jun 17, 2026

CVE-2021-38685 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A command injection vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows remote attackers to run arbitrary commands. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.47%

70.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Qnap	Qvr	< 5.1.6

References

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

Timeline

Published: Nov 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38685?

How severe is CVE-2021-38685?

CVE-2021-38685 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38685?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38685?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST