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

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
QNAP Systems Inc. QTS unaffected
Version Status Constraints
5.2.x affected < 5.2.8.3350 build 20251216
QNAP Systems Inc. QuTS hero unaffected
Version Status Constraints
h5.3.x affected < h5.3.2.3354 build 20251225
h5.2.x affected < h5.2.8.3350 build 20251216

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Qnap Systems Subscribe
Qts Subscribe
Quts Hero Subscribe

Project Subscriptions

Vendors Products
Qnap Systems Subscribe
Qts Subscribe
Quts Hero Subscribe
Advisories

No advisories yet.

Fixes

Solution

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

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.qnap.com/en/security-advisory/qsa-26-05 cve-icon cve-icon
History

Wed, 11 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Qnap Systems
Qnap Systems qts
Qnap Systems quts Hero
Vendors & Products Qnap Systems
Qnap Systems qts
Qnap Systems quts Hero

Wed, 11 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 11 Feb 2026 12:45:00 +0000

Type Values Removed Values Added
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
Title QTS, QuTS hero
Weaknesses CWE-59
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-02-11T16:49:06.520Z

Reserved: 2025-11-26T09:25:37.832Z

Link: CVE-2025-66277

cve-icon Vulnrichment

Updated: 2026-02-11T16:49:03.424Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-11T13:15:58.380

Modified: 2026-02-11T15:27:26.370

Link: CVE-2025-66277

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:45:34Z

Weaknesses