9.8

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

CVSS: 9.8v3.1CriticalKEVAnalyzed
Published 03-02-2021Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2020-2506 is a critical (CVSS 9.8) Improper Access Control vulnerability in QNAP Systems Helpdesk. It is known to be exploited: CISA lists it, first on 25-03-2022. EPSS estimates a 1.98% chance of exploitation in the next 30 days, higher than 80.2% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.98%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-02-2021
    PublishedVulnerability first disclosed.
  2. 25-03-2022
    Added to CISA KEVQNAP Helpdesk Improper Access Control Vulnerability
  3. 15-04-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.98%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.98% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.98%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
25-03-2022
Federal due date
15-04-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2020-2506

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Qnap1 product
Qnap systems inc.1 product

2 vendors · 2 products

References

2 links