How severe is CVE-2021-28814?

CVE-2021-28814 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28814 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28814?

CVE-2021-28814 affects Qnap Helpdesk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28814?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28814 published?

CVE-2021-28814 was published on 2021-06-11 and last updated on 2026-06-17.

CVE-2021-28814

CVE-2021-28814 is a high-severity vulnerability in Qnap Helpdesk with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Qnap Helpdesk
Published: 2021-06-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-28814?: 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.
How severe is CVE-2021-28814?: CVE-2021-28814 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28814 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28814?: CVE-2021-28814 affects Qnap Helpdesk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28814?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28814 published?: CVE-2021-28814 was published on 2021-06-11 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:qnap:helpdesk:*:*:*:*:*:*:*:*

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