# CVE-2025-66644: Array Networks ArrayOS AG OS command injection

Source: https://junglewise.ai/threats/cve-2025-66644-array-networks-arrayos-ag-os-command-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-08. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2025-66644 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2025-12-08

Array Networks ArrayOS AG, a secure gateway used for remote access and VPN services, contains a critical vulnerability that allows attackers to run unauthorized commands on the system. This flaw has been actively exploited in the wild to install web shells, which can give attackers permanent access to the corporate network and the ability to steal sensitive data. Organizations using these gateways should update to the latest firmware immediately to prevent unauthorized access and potential ransomware incidents.

## Quick answers

**Is CVE-2025-66644 exploited in the wild?** Yes. CVE-2025-66644 is known to be exploited in the wild, first recorded on 8 December 2025. Treat it as urgent.

**How severe is CVE-2025-66644?** Critical severity, with a CVSS score of 9.8, published 8 December 2025.

**Which products and versions are affected?** Array Networks ArrayOS AG before 9.4.5.9.

**Is there a fix for CVE-2025-66644?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-66644 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-66644?** Check whether you run Array Networks ArrayOS AG at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An OS command injection vulnerability (CWE-78) exists in Array Networks ArrayOS AG before version 9.4.5.9. The flaw stems from improper neutralization of special elements used in an OS command, allowing a remote attacker to execute arbitrary code with high privileges. While some assessments suggest high privileges are required, NIST has rated this as unauthenticated (PR:N) with a CVSS score of 9.8. The vulnerability has been actively exploited in the wild since August 2025 to deploy web shells on affected appliances. Users are advised to upgrade to version 9.4.5.9 or later.

## Affected products

- Array Networks ArrayOS AG before 9.4.5.9

## Timeline

- 2025-08: exploited: Earliest reported exploitation in the wild.
- 2025-12-05: disclosed: Initial CVE publication.
- 2025-12-08: kev added: Added to CISA Known Exploited Vulnerabilities catalog.