Threat Intelligence / CVE / CVE-2025-66281

CVE-2025-66281

CVSS 6.9 · EPSS 0.3% · Priority 4.5/10 · Published 2026-06-10

As of 2026-06-10, CVE-2025-66281 is a CVSS 6.9 vulnerability. EPSS exploitation probability 0.3%. Threadlinqs Intelligence tracks 1 threat exploiting it.

Last updated: 2026-06-10

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack. 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

Weaknesses (CWE)

CWE-476

Threats tracking this CVE

QNAP QSA-26-10: Multiple Injection and Memory-Safety Vulnerabilities in QTS, QuTS hero, QuTS cloud, QVP, and File Station (CVE-2025-66273, CVE-2026-26240, and 12 others) — HIGH

References

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

Full detection coverage & IOCs for threats exploiting CVE-2025-66281 are available via the Threadlinqs MCP server (Purple tier). View plans →

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.