CVE-2025-66644

CVE-2025-66644 is a command injection vulnerability (CWE-78) affecting Array Networks ArrayOS AG versions prior to 9.4.5.9. This flaw allows attackers to execute arbitrary commands on the affected system. The vulnerability received a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant impact on confidentiality, integrity, and availability following network-based exploitation with low complexity but requiring high privileges.

Exploitation requires an attacker to have high-level privileges (PR:H) on the target system, such as an authenticated administrative user. Once exploited, attackers can achieve full system compromise, including high impacts across confidentiality, integrity, and availability. In real-world attacks observed from August through December 2025, threat actors leveraged this vulnerability to deploy webshells on ArrayOS AG VPN appliances.

Advisories recommend upgrading to ArrayOS AG version 9.4.5.9 or later to mitigate the vulnerability. The flaw is listed in the CISA Known Exploited Vulnerabilities Catalog, mandating patching by federal agencies. Additional guidance appears in JPCERT advisory AT-2025-0024 and an Array Networks support announcement.

This vulnerability has seen active in-the-wild exploitation, as documented by multiple sources including BleepingComputer reports on webshell deployments.