CVE-2021-34351

Name: CVE-2021-34351
Creator: NVD / NIST
Published: 2021-09-27T01:15:06.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.47%

Last modified Jun 17, 2026

CVE-2021-34351 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A command injection vulnerability has been reported to affect QNAP device running QVR. If exploited, this vulnerability could allow 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 running QVR. If exploited, this vulnerability could allow remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR 5.1.5 build 20210803 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

Affected Software

Vendor	Product	Versions
Qnap	Qvr	< 5.1.5

References

https://www.qnap.com/en/security-advisory/qsa-21-35Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-21-35Vendor Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34351?

How severe is CVE-2021-34351?

CVE-2021-34351 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-2021-34351?

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-2021-34351?

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

Scan your code now

Source: NVD / NIST