Security readout for executives and security teams
Plain-English summary
CVE-2025-66644 is a command injection flaw in Array Networks ArrayOS AG before 9.4.5.9. Public reporting and the CVE description say it was exploited in the wild, including webshell deployment. Organizations using affected Array AG VPN/access gateway systems should treat this as urgent because compromise could affect confidentiality, integrity, and availability.
Executive priority
Prioritize within emergency patch and threat-hunting workflows for any exposed ArrayOS AG systems. The business risk is elevated because exploitation has been publicly reported and affected systems are VPN/access infrastructure, often positioned at the network edge.
Technical view
The issue is CWE-78 command injection in ArrayOS AG before 9.4.5.9. CVSS 3.1 is 7.2: network reachable, low complexity, high privileges required, no user interaction, and high CIA impact. The source bundle says exploitation occurred August through December 2025; BleepingComputer reports attackers planted webshells.
Likely exposure
Exposure is most likely for internet-facing Array Networks ArrayOS AG appliances running versions before 9.4.5.9. The CVSS vector indicates exploitation requires high privileges, but public exploitation reporting raises the operational risk for externally reachable systems.
Exploitation context
Sources support in-the-wild exploitation, but not enough detail is provided to confirm current active exploitation. The CISA KEV flag in the provided bundle is false, despite a KEV search URL being listed. Reported attacker activity includes webshell placement on affected VPN systems.
Researcher notes
Evidence is limited to the CVE summary and cited public references. The provided affected data is sparse, but the title and description identify ArrayOS AG before 9.4.5.9. Do not assume other Array products are affected without vendor confirmation.
Mitigation direction
- Identify all Array Networks ArrayOS AG deployments and owners.
- Upgrade affected systems to 9.4.5.9 or follow current Array Networks guidance.
- Restrict management access to trusted networks and administrators.
- Review vendor and JPCERT guidance for indicators and response advice.
- If compromise is suspected, perform incident response before returning systems to service.
Validation and detection
- Confirm the exact ArrayOS AG version on each appliance.
- Prioritize any internet-facing or remotely administered systems.
- Review appliance logs for unusual administrative activity.
- Check for unexpected web files or webshell indicators per trusted advisories.
- Verify whether CISA KEV status changes for this CVE.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-66644 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.jpcert.or.jp/at/2025/at250024.htmlCVE reference
- https://x.com/ArraySupport/status/1921373397533032590CVE reference
- https://www.bleepingcomputer.com/news/security/hackers-are-exploiting-arrayos-ag-vpn-flaw-to-plant-webshells/CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66644CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.