Exploitation timeline
Threadlinqs has recorded 12 QNAP Systems CVEs published between and . The busiest month was 2026-06 (11 new CVEs). None of them is listed in CISA KEV yet.
Most exploited vulnerabilities
Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 12 of 12 tracked QNAP Systems CVEs.
- CVE-2025-66273high 7.2EPSS 1%
- CVE-2025-66279high 7.2EPSS 1%
- CVE-2026-22893high 7.2EPSS 1%
- CVE-2025-11837critical 9.8EPSS 0.8%
- CVE-2025-66281medium 6.9EPSS 0.3%
- CVE-2025-66280high 7.2EPSS 0.3%
- CVE-2026-26240critical 9.1EPSS 0.3%
- CVE-2026-26241critical 9.1EPSS 0.3%
- CVE-2025-62858medium 6.5EPSS 0.3%
- CVE-2026-26239high 8.1EPSS 0.3%
- CVE-2026-24724high 8.1EPSS 0.3%
- CVE-2025-59382low 1.2EPSS 0.3%
Products affected
Threadlinqs normalises CPE and CNA product records across all 12 CVEs; 5 distinct QNAP Systems products are affected. The most frequently affected:
- QTS 7 CVEs
- QuTS hero 7 CVEs
- File Station 5 4 CVEs
- Malware Remover 1 CVE
- QuTScloud 1 CVE
Threat activity
2 tracked threat campaigns reference QNAP Systems products or exploit QNAP Systems CVEs:
- 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
- AryStinger (Ary-Attack) Botnet Compromises 4,000+ Legacy D-Link/RTL819X Routers and NAS for Global Attack Proxy Infrastructure (CVE-2013-3307, CVE-2016-5681, CVE-2025-11837)HIGH
How to prioritise QNAP Systems patching
This order follows the data Threadlinqs holds for QNAP Systems, not a generic severity checklist:
- No QNAP Systems CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are CVE-2025-66273 (1%), CVE-2025-66279 (1%), CVE-2026-22893 (1%).
- 3 CVEs score Critical and 6 High on CVSS v3 (maximum 9.8, average 7.3); sequence these after KEV and high-EPSS items.
About this data
Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.