CVE Catalog

CVE-2026-23759

High
Published: Translated: NVD NIST

Summary

Perle IOLAN STS/SCS terminal servers with firmware versions prior to 6.0 allow authenticated users to inject OS commands via the restricted shell accessed over Telnet or SSH. The 'ps' command does not perform proper argument sanitization, allowing user-supplied parameters to be passed into an 'sh -c' invocation running as root.

Risk Assessment

An authenticated attacker who can log in to the device can inject shell metacharacters after the 'ps' subcommand, leading to the execution of arbitrary OS commands with root privileges, resulting in full compromise of the underlying operating system.

Recommendation

It is recommended to update the firmware to version 6.0 or later to mitigate this vulnerability. Additionally, access to Telnet and SSH shells should be restricted to trusted users.

Related vulnerabilities

Original NVD description (English source)

Perle IOLAN STS/SCS terminal server models with firmware versions prior to 6.0 allow authenticated OS command injection via the restricted shell accessed over Telnet or SSH. The shell 'ps' command does not perform proper argument sanitization and passes user-supplied parameters into an 'sh -c' invocation running as root. An authenticated attacker who can log in to the device can inject shell metacharacters after the 'ps' subcommand to execute arbitrary OS commands with root privileges, leading to full compromise of the underlying operating system.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS