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Fencer Vulns
critical 9.8

CVE-2020-2500 json

This improper access control vulnerability in Helpdesk allows attackers to get control of QNAP Kayako service.

published 2020-07-01 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-22293

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

This improper access control vulnerability in Helpdesk allows attackers to get control of QNAP Kayako service. Attackers can access the sensitive data on QNAP Kayako server with API keys. We have replaced the API key to mitigate the vulnerability, and already fixed the issue in Helpdesk 3.0.1 and later versions.

Patch / fix

  • QNAP Systems Inc. Helpdesk 3.0.1

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

  • QNAP Systems Inc. Helpdesk

Classification

Weakness
  • CWE-284 Improper Access Control
  • CWE-321 Use of Hard-coded Cryptographic Key
  • CWE-798 Use of Hard-coded Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.