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No exploitation reportedFix available

CVE-2025-66279

No exploitation reported by the sources we read.

  • Published2026-06-10
  • Fixed inh6.0.0.3397 · h5.3.4.3500 · h5.2.9.3410
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A command injection vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to execute arbitrary commands. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

Timeline

dates in UTC
  1. 2026-06-1004:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-66279?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-66279?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Qnap quts hero
BranchAffectedFixed in
—≥ h6.0.0.3324, < h6.0.0.3397h6.0.0.3397
—≥ h5.3.0.3115, < h5.3.4.3500h5.3.4.3500
—≥ h5.2.0.2737, < h5.2.9.3410h5.2.9.3410
Qnap qts
BranchAffectedFixed in
5.2≥ 5.2.0.2737, < 5.2.9.34105.2.9.3410

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Qnap quts hero to h6.0.0.3397 · h5.3.4.3500 · h5.2.9.3410

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-06-10
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.6read 2026-10-23
  • NVDCVSS 3.17.2read 2026-10-23
  • CNAweakness (CWE)CWE-78read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-06-10
Last Modified
2026-07-23
NVD status
Analyzed

Frequently asked questions

What is CVE-2025-66279?

A command injection vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to execute arbitrary commands. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

Is CVE-2025-66279 actively exploited?

Active exploitation of CVE-2025-66279 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-66279?

CVE-2025-66279 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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