CVE-2021-28814: Improper Access Control Vulnerability in Helpdesk

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-11 · updated 2026-06-17
Weakness: CWE-269

Description

An improper access control vulnerability has been reported to affect QNAP NAS. If exploited, this vulnerability allows remote attackers to compromise the security of the software. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.4.

Affected products

QNAP Systems Inc. Helpdesk: before 3.0.4 — fixed in 3.0.4

How to fix

Upgrade to a fixed version: QNAP Systems Inc. Helpdesk 3.0.4. Check the vendor advisory for mitigations.

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-25
https://www.qnap.com/zh-tw/security-advisory/qsa-21-25

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