Known exploited vulnerability
CVE-2025-66644
The short answer
CVE-2025-66644 affects Array Networks ArrayOS AG and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-12-08: attackers are using it, so patch it first.
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.
Weakness: CWE-78.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Dec 8, 2025
Federal due date Dec 29, 2025
EPSS, next 30 days
3.3%
Higher than 89% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
ArrayOS AG. NVD's record lists the exact affected versions.
References
- www.bleepingcomputer.com/news/security/hackers-are-exploiting-arrayos-ag-vpn-flaw-to-plant-webshells/ Press/Media Coverage
- www.jpcert.or.jp/at/2025/at250024.html Third Party Advisory
- x.com/ArraySupport/status/1921373397533032590 Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66644 US Government Resource
Questions
Is CVE-2025-66644 being exploited?
Yes. CISA added CVE-2025-66644 to its Known Exploited Vulnerabilities catalog on 2025-12-08, with a federal remediation due date of 2025-12-29.
How do I fix CVE-2025-66644?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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