TI-2025-40758 Aliases CVE-2025-66280 GHSA-25q9-p4j4-6rj7

Stack-based buffer overflow in QNAP QTS

LOW 24CWE-121Published 2026-06-10 · Updated 2026-06-10

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

An integer overflow or wraparound vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to compromise the security of the system. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00436 38th percentileScored 2026-11-07

Fix Fixed QTS (QNAP Systems Inc.): 5.2.9.3410 build 20260214QuTS hero (QNAP Systems Inc.): h5.2.9.3410 build 20260214, h5.3.4.3500 build 20260520, h6.0.0.3397 build 20260206

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
QNAP	QTS	5.2.0 to before 5.2.9.3410 build 20260214	5.2.9.3410 build 20260214	Patch available	CNA
QNAP	QuTS hero	h5.2.0 to before h5.2.9.3410 build 20260214; h5.3.0 to before h5.3.4.3500 build 20260520; ? to before h6.0.0.3397 build 20260206	h5.2.9.3410 build 20260214, h5.3.4.3500 build 20260520, h6.0.0.3397 build 20260206	Patch available	CNA

QTS VendorQNAP Affected 5.2.0 to before 5.2.9.3410 build 20260214 Fixed in 5.2.9.3410 build 20260214 Patch available CNA
QuTS hero VendorQNAP Affected h5.2.0 to before h5.2.9.3410 build 20260214; h5.3.0 to before h5.3.4.3500 build 20260520; ? to before h6.0.0.3397 build 20260206 Fixed in h5.2.9.3410 build 20260214, h5.3.4.3500 build 20260520, h6.0.0.3397 build 20260206 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:qnap:qts::::::::	5.2.0.2737 to before 5.2.9.3410	Vulnerable	QNAP
cpe:2.3:o:qnap:quts_hero::::::::	h5.2.0.2737 to before h5.2.9.3410; h5.3.0.3115 to before h5.3.4.3500; h6.0.0.3324 to before h6.0.0.3397	Vulnerable	QNAP

cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:* Versions 5.2.0.2737 to before 5.2.9.3410 Vulnerable ·QNAP
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:* Versions h5.2.0.2737 to before h5.2.9.3410; h5.3.0.3115 to before h5.3.4.3500; h6.0.0.3324 to before h6.0.0.3397 Vulnerable ·QNAP

Remediation

Fix · CNA QTS (QNAP Systems Inc.) Fixed in 5.2.9.3410 build 20260214
Fix · CNA QuTS hero (QNAP Systems Inc.) Fixed in h5.2.9.3410 build 20260214, h5.3.4.3500 build 20260520, h6.0.0.3397 build 20260206

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-06-10
QNAP Systems QTS 5.2.9.3410 build 20260214
6 records Highest priority Priority MEDIUM 3 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-18381 OS command injection in QNAP QTSPriority MEDIUM 41
- TI-2025-40757 OS command injection in QNAP QTSPriority MEDIUM 41
- TI-2025-40752 OS command injection in QNAP QTSPriority MEDIUM 41
Show all 6 records →
Release · 2026-06-10
QNAP Systems QuTS hero h5.2.9.3410 build 20260214, h5.3.4.3500 build 20260520, h6.0.0.3397 build 20260206
4 records Highest priority Priority MEDIUM 2 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2025-40757 OS command injection in QNAP QTSPriority MEDIUM 41
- TI-2025-40752 OS command injection in QNAP QTSPriority MEDIUM 41
- TI-2025-40759 NULL pointer dereference in QNAP QTSPriority LOW 37
Show all 4 records →

Timeline

2026-10-02 Threatist record created from CVE-2025-66280
2026-10-03 Alias added: GHSA-25q9-p4j4-6rj7

References

Advisory 1

https://www.qnap.com/en/security-advisory/qsa-26-10

TI-2020-02221 Command Injection Vulnerability in QTS and QuTS hero KEVCVSS 3.1CRITICAL 9.8
TI-2019-05101 Improper input validation in QNAP NAS devices KEVCVSS 3.1CRITICAL 9.8
TI-2018-14137 Improper input validation in QNAP QTS KEVCVSS 3.1CRITICAL 9.8
TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
TI-2018-14131 Cross-site scripting in QNAP QTS KEVCVSS 3.1HIGH 8.0

See all 282 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences