CVE-2021-34346

9.8 criticalEPSS 1.6%

Critical (9.8) in qnap nvr storage expansion firmware. EPSS 1.6% chance of exploitation in the next 30 days.

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

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 75% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2021-09-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

qnap:nvr_storage_expansion_firmware

References

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

Check your stack JSON