CVE-2025-22469: CL4/6NX Plus OS Command Injection RCE Flaw

CVE-2025-22469 Overview

CVE-2025-22469 is an operating system (OS) command injection vulnerability [CWE-78] affecting SATO CL4NX Plus, CL6NX Plus, and the Japan-region CL4NX-J Plus and CL6NX-J Plus industrial label printers. Firmware versions prior to 1.15.5-r1 allow an authenticated user holding a non-administrative role to execute arbitrary OS commands on the device. The flaw originates from improper neutralization of special elements passed to a system shell. Successful exploitation grants attackers a foothold on the printer's underlying operating system through legitimate, low-privileged access.

Critical Impact

An authenticated non-administrative user can execute arbitrary OS commands on the printer, exposing the device to lateral movement, configuration tampering, and integration into broader attack chains.

Affected Products

• SATO CL4NX Plus and CL6NX Plus with firmware prior to 1.15.5-r1
• SATO CL4NX-J Plus (Japan model) with firmware prior to 1.15.5-r1
• SATO CL6NX-J Plus (Japan model) with firmware prior to 1.15.5-r1

Discovery Timeline

• 2025-08-06 - CVE-2025-22469 published to the National Vulnerability Database (NVD)
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-22469

Vulnerability Analysis

The vulnerability is classified under [CWE-78], Improper Neutralization of Special Elements used in an OS Command. The affected SATO CL-NX Plus series printers expose management functionality that, when invoked by an authenticated non-administrative user, passes user-controlled input to a system shell without adequate sanitization. An attacker can append or inject shell metacharacters to break out of the intended command context and execute arbitrary commands under the privileges of the printer's management process.

Because the attack vector is network-based and requires only a non-administrative account, the vulnerability lowers the bar for adversaries already inside the network or in possession of leaked operator credentials. The EPSS probability is 0.449%, indicating a modest near-term exploitation likelihood, but industrial printers often sit on flat networks with limited monitoring, increasing real-world exposure.

Root Cause

The root cause is the construction of OS-level shell commands using untrusted input supplied through an authenticated management interface. The firmware does not enforce a strict allowlist or perform argument escaping before delegating execution to the shell. As a result, characters such as ;, |, &, and backticks are interpreted as command separators rather than literal data.

Attack Vector

An attacker first authenticates to the printer's management interface using any account with operator-level privileges. The attacker then submits a crafted parameter containing shell metacharacters to a vulnerable handler reachable over the network. The injected payload executes within the printer's OS context, granting command execution without requiring administrative credentials. No specific public proof-of-concept code has been released; technical details are described in prose in the vendor and JVN advisories. See the JVN #16547726 Advisory and the SATO Global Support Notice for vendor-supplied technical context.

Detection Methods for CVE-2025-22469

Indicators of Compromise

• Unexpected outbound network connections originating from SATO CL-NX Plus printer management IP addresses.
• Authentication events for non-administrative printer accounts followed by anomalous configuration changes or firmware activity.
• HTTP or API requests to printer management endpoints containing shell metacharacters such as ;, |, &&, or backticks in parameter values.

Detection Strategies

• Inspect web and API traffic to printer management interfaces for parameter values containing OS shell metacharacters or command keywords like wget, curl, nc, or /bin/sh.
• Correlate successful non-administrative logins to SATO printers with subsequent outbound network activity from those same devices.
• Baseline printer network behavior and alert on deviations such as new listening ports, unexpected DNS queries, or scanning activity sourced from the printer.

Monitoring Recommendations

• Forward authentication logs and management-interface access logs from SATO printers to a centralized logging or SIEM platform for long-term retention and correlation.
• Place industrial printers on a segmented VLAN and monitor north-south traffic with network detection tooling to surface command-and-control or lateral movement attempts.
• Track firmware version inventory across the printer fleet and alert when any device reports a version earlier than 1.15.5-r1.

How to Mitigate CVE-2025-22469

Immediate Actions Required

• Upgrade affected SATO CL4NX Plus, CL6NX Plus, CL4NX-J Plus, and CL6NX-J Plus devices to firmware 1.15.5-r1 or later.
• Rotate credentials for all non-administrative printer accounts and remove accounts that are no longer required.
• Restrict management-interface access to a dedicated administrative network or jump host using firewall rules or access control lists.

Patch Information

SATO has released firmware version 1.15.5-r1, which remediates the OS command injection flaw. Refer to the SATO Global Support Notice for download instructions and applicability per model, and to the JVN #16547726 Advisory for the coordinated disclosure summary.

Workarounds

• Disable or limit non-administrative accounts on affected printers until firmware can be updated.
• Block network access to the printer management interface from general-purpose user subnets using firewall or switch ACL rules.
• Enforce strong, unique passwords for all printer accounts to reduce the likelihood of credential-based access by an attacker.