What is CVE-2025-66644?

CVE-2025-66644 is a high-severity vulnerability in Array Networks Arrayos Ag, classified under OS Command Injection. CVSS score: 7.2/10. Published 2025-12-05.

How severe is CVE-2025-66644?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2025-66644 known to be exploited?

Yes. CVE-2025-66644 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-08), indicating it is being actively exploited.

RCE in Array Networks Arrayos Ag

CVE-2025-66644

Array Networks ArrayOS AG before 9.4.5.9 allows command injection, as exploited in the wild in August through December 2025.

Vulnerability class: Command Injection (OS Command Injection)

Published 2025-12-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.034 (88.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-78 — OS Command Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-12-08. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-12-29.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

www.jpcert.or.jp/at/2025/at250024.html (Third Party Advisory)
x.com/ArraySupport/status/1921373397533032590 (Third Party Advisory)
www.bleepingcomputer.com/news/security/hackers-are-exploiting-arrayos-ag-vpn-fl… (Press/Media Coverage)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-66644?: CVE-2025-66644 is a high-severity vulnerability in Array Networks Arrayos Ag, classified under OS Command Injection. CVSS score: 7.2/10. Published 2025-12-05.
How severe is CVE-2025-66644?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2025-66644 known to be exploited?: Yes. CVE-2025-66644 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-08), indicating it is being actively exploited.