What is CVE-2020-2506?

CVE-2020-2506 is a high-severity vulnerability in QNAP Helpdesk, classified under Improper Access Control. CVSS score: 7.3/10. Published 2021-02-03.

How severe is CVE-2020-2506?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2020-2506 known to be exploited?

Yes. CVE-2020-2506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.

Vulnerability in QNAP Helpdesk

CVE-2020-2506

The vulnerability have been reported to affect earlier versions of QTS. If exploited, this improper access control vulnerability could allow attackers to compromise the security of the software by gaining privileges, or reading sensitive information. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.3.

Published 2021-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.020 (80.2th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

QNAP Helpdesk
QNAP Systems Inc. Helpdesk — versions unspecified

Weakness classification (CWE)

CWE-284 — Improper Access Control

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-15.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.qnap.com/zh-tw/security-advisory/qsa-20-08 (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2020-2506?: CVE-2020-2506 is a high-severity vulnerability in QNAP Helpdesk, classified under Improper Access Control. CVSS score: 7.3/10. Published 2021-02-03.
How severe is CVE-2020-2506?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2020-2506 known to be exploited?: Yes. CVE-2020-2506 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.