Vulnerability · Published Mar 17, 2026 · Assigned by VulnCheck
CVE-2026-23759Perle IOLAN STS/SCS Authenticated Command Injection via 'shell ps'
High 7.2
In plain English
A high-severity OS command injection in IOLAN SCS from Perle Systems. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Perle Systems | IOLAN STS | 0 – before 6.0 |
| Perle Systems | IOLAN SCS | 0 – before 6.0 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H