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CVE-2025-66277

QNAP Qts vulnerability

9.8 CRITICALEPSS 0.72%
  1. Published11 Feb 2026

Description

A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations. We have already fixed the vulnerability in the following versions: QTS 5.2.8.3350 build 20251216 and later QuTS hero h5.3.2.3354 build 20251225 and later QuTS hero h5.2.8.3350 build 20251216 and later

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

QNAP Qts5.2.0.2737 · 5.2.0.2744 · 5.2.0.2782 · 5.2.0.2802
QNAP Quts Heroh5.2.0.2737 · h5.2.0.2782 · h5.2.0.2789 · h5.2.0.2802

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-66277 being actively exploited?

CVE-2025-66277 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.72%.

How severe is CVE-2025-66277?

CVE-2025-66277 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2025-66277?

Affected products include QNAP Qts, QNAP Quts Hero.

How do I fix CVE-2025-66277?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66277 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.