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CVE-2025-66277

9.8 · CRITICAL

A link following vulnerability has been reported to affect several QNAP operating system versions.

Published Feb 11, 2026CWE-59EPSS 0.71%

Overview

CVE-2025-66277 is a critical-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.qnap.com/en/security-advisory/qsa-26-05

How CyberStrike helps

Frequently asked questions

What is CVE-2025-66277?

CVE-2025-66277 is a critical-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-66277?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-66277?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-66277?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-66277 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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