CVE-2020-2506: QNAP Helpdesk Improper Access Control Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, 415 days after the CVE record was published.

How likely is exploitation in the next 30 days?

2%

EPSS score, percentile 80.5 of all scored records

How severe?

7.3 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA deadline 15 Apr 2022. Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

• before 3.0.3

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 15 April 2022.

Solution (from the CVE record)

QNAP has already fixed these issues in Helpdesk 3.0.3 and later versions.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

• https://nvd.nist.gov/vuln/detail/CVE-2020-2506

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

QNAP Helpdesk contains an improper access control vulnerability which could allow an attacker to gain privileges or to read sensitive information.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2020-2506 to its Known Exploited Vulnerabilities (KEV) catalog on 25 Mar 2022.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 15 Apr 2022.
• The CVE record was published on 3 Feb 2021, 415 days before it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 7.3 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 2% (percentile 80.5), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

improper access control vulnerability in Helpdesk

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-284: Improper Access Control

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

References

• qnap.com

More exploited QNAP vulnerabilities

• CVE-2023-47565: QNAP VioStor NVR OS Command Injection Vulnerability (added 21 Dec 2023)
• CVE-2022-27593: QNAP Photo Station Externally Controlled Reference Vulnerability (added 8 Sep 2022)
• CVE-2019-7192: QNAP Photo Station Improper Access Control Vulnerability (added 8 Jun 2022)
• CVE-2019-7193: QNAP QTS Improper Input Validation Vulnerability (added 8 Jun 2022)
• CVE-2019-7194: QNAP Photo Station Path Traversal Vulnerability (added 8 Jun 2022)
• CVE-2019-7195: QNAP Photo Station Path Traversal Vulnerability (added 8 Jun 2022)