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Vulnerability · Published Feb 11, 2026 · Assigned by qnap

CVE-2025-66277QTS, QuTS hero

Critical 9.2

In plain English

A critical-severity security flaw in QTS from QNAP Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 4.0)9.2Critical
Exploit odds (30 days)0.7%top 46.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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

Affected products (as reported)

VendorProductVersions
QNAP Systems Inc. QTS 5.2.x – before 5.2.8.3350 build 20251216
QNAP Systems Inc. QuTS hero h5.3.x – before h5.3.2.3354 build 20251225h5.2.x – before h5.2.8.3350 build 20251216

Weakness: CWE-59 · 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

References