EUVD-2026-12580
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
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.
Analysis
An authenticated OS command injection vulnerability exists in Perle IOLAN STS and SCS terminal servers running firmware versions prior to 6.0. An attacker with valid credentials can inject shell metacharacters through the restricted shell's 'ps' command when accessing the device via Telnet or SSH, escalating to root privileges and achieving full system compromise. …
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Remediation
Within 24 hours: Inventory all Perle IOLAN STS/SCS devices in your environment and document firmware versions; disable Telnet access and restrict SSH to trusted IP ranges only. Within 7 days: Contact Perle for firmware 6.0 availability and test in non-production environment; implement network segmentation to isolate terminal servers from general user access. …
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External POC / Exploit Code
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