Critical 9.2Published Feb 11, 2026

CVE-2025-66277QTS, QuTS hero

Updated under an hour ago (Oct 27, 2026, 3:50 AM ET)

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It affects QNAP Systems Inc. QTS and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for QNAP Systems Inc. QTS

Exploited in the last 30 days

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: 9.2 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-59
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: qnap
NVD analysis: Analyzed
Record last updated: Feb 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

QNAP Systems Inc. QTS qnap_systems:qts (from the name)	from 5.2.x before 5.2.8.3350 build 20251216	CNA record
QNAP Systems Inc. QuTS hero qnap_systems:quts_hero (from the name)	from h5.3.x before h5.3.2.3354 build 20251225; from h5.2.x before h5.2.8.3350 build 20251216	CNA record
qnap qts qnap:qts	5.2.0.2737; 5.2.0.2744; 5.2.0.2782; 5.2.0.2802; 5.2.0.2823; 5.2.0.2851; 5.2.0.2860; 5.2.1.2930; and 11 more ranges	NVD
qnap quts_hero qnap:quts_hero	h5.2.0.2737; h5.2.0.2782; h5.2.0.2789; h5.2.0.2802; h5.2.0.2823; h5.2.0.2851; h5.2.0.2860; h5.2.1.2929; and 10 more ranges	NVD

References

References

https://www.qnap.com/en/security-advisory/qsa-26-05	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.