What’s Vulnerable › Vulnerabilities

CVE-2021-34346: Stack Based Overflow Vulnerability in NVR Storage Expansion

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-10 · updated 2026-06-17
• Weakness: CWE-787

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

Affected products

• QNAP Systems Inc. NVR Storage Expansion: before 1.0.6 — fixed in 1.0.6

How to fix

Upgrade to a fixed version: QNAP Systems Inc. NVR Storage Expansion 1.0.6. Check the vendor advisory for mitigations.

References

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

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