CVE-2025-66280

Description

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

CVSS v3.1 Score

7.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0044

Probability of exploitation

0.35%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-121 CWE-121

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
qnap	qts	5.2.0.2737 — 5.2.9.3410
qnap	quts_hero	h5.2.0.2737 — h5.2.9.3410
qnap	quts_hero	h5.3.0.3115 — h5.3.4.3500
qnap	quts_hero	h6.0.0.3324 — h6.0.0.3397

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2025-66280? +

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 It has a CVSS v3.1 base score of 7.2 (HIGH).

How severe is CVE-2025-66280? +

CVE-2025-66280 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0044, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2025-66280? +

CVE-2025-66280 affects products from qnap, specifically: qts, quts_hero. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66280? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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