Array Networks ArrayOS AG OS Command Injection Vulnerability (CVE-2025-66644)

Array Networks ArrayOS AG contains an OS command injection vulnerability that could allow an attacker to execute arbitrary commands.

Published Dec 5, 2025 · Updated May 29, 2026

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Why patchRisk explained in plain English

Worst-case scenarioIf unpatched

A remote attacker, with administrative privileges, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2025-12-29 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a OS Command Injection (CWE-78) vulnerability in Array Networks ArrayOS AG. Array Networks ArrayOS AG before 9.4.5.9 allows command injection, as exploited in the wild in August through December 2025. Exploitation requires remote network access, low attack complexity, an administrative account, and no user interaction required.

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security

●Running arrayos ag: v < 9.4.5.9

Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://www.bleepingcomputer.com/news/security/hackers-are-exploiting-arrayos-ag-vpn-flaw-to-plant-webshells/

How to patch

Get the fix

Apply the fixed package from your vendor. The advisory lists affected versions and the exact fixed build.

↗ Vendor advisory

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA 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.