Security Digest · Vulnerability record · Known exploited
CVE-2025-66644: Array Networks ArrayOS AG OS Command Injection Vulnerability
Exploited in the wild (CISA KEV). Array Networks ArrayOS AG before 9.4.5.9 allows command injection, as exploited in the wild in August through December 2025.
CISA KEV · added 2025-12-08 CVSS 7.2 High EPSS 3.4% · p89
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Array Networks ArrayOS AG. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-12-08, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-12-29; treat that as the outer limit, not the target.
- EPSS 3.4%, percentile 89: FIRST’s model estimates a 3.4% chance of exploitation activity in the next 30 days, higher than 89% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.
What it is
Array Networks ArrayOS AG before 9.4.5.9 allows command injection, as exploited in the wild in August through December 2025.
CISA’s summary
Array Networks ArrayOS AG contains an OS command injection vulnerability that could allow an attacker to execute arbitrary commands.
Weakness type: CWE-78.
Product: Array Networks ArrayOS AG · Assigned by: mitre · Published: 2025-12-05
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Array Networks | ArrayOS AG | < 9.4.5.9 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| mitre | 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: high (admin)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-12-08; federal due date 2025-12-29. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 3.42% probability of exploitation activity in the next 30 days; percentile 89.
Timeline
- — CVE record published by mitre
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (support.arraynetworks.net) support.arraynetworks.net
- Listed in CISA KEV notes (jpcert.or.jp) jpcert.or.jp
Vulnerability records
- CVE.org record CVE-2025-66644 cve.org
- NVD entry CVE-2025-66644 nvd.nist.gov
Government
Other references from the CVE record and advisory
- x.com x.com
- bleepingcomputer.com bleepingcomputer.com
All exploited Array Networks vulnerabilities · Today’s Security Digest