CVE-2021-34346

Name: CVE-2021-34346
Creator: NVD / NIST
Published: 2021-09-10T04:15:18.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2021-34346 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack buffer overflow vulnerability has been reported to affect QNAP device running NVR Storage Expansion. If exploited, this vulnerability allows attackers to execute arbitrary code. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

A stack buffer overflow vulnerability has been reported to affect QNAP device running NVR Storage Expansion. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of NVR Storage Expansion: NVR Storage Expansion 1.0.6 ( 2021/08/03 ) 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

1.53%

71.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qnap	Nvr Storage Expansion Firmware	< 1.0.6

References

https://www.qnap.com/en/security-advisory/qsa-21-36Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-21-36Vendor Advisory

Timeline

Published: Sep 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34346?

How severe is CVE-2021-34346?

CVE-2021-34346 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34346?

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-2021-34346?

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

Scan your code now

Source: NVD / NIST