CVE-2026-23759CWE-78

Perle IOLAN STS/SCS Authenticated Command Injection via 'shell ps'

High · published March 17, 2026

CVSS v4.0
8.6
EPSS
2%
Percentile
75.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.01568 · 75.1th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-03-17T15:20Z
EPSS history
Timeline
  • 17 MAR 15:20Z
    Perle IOLAN STS/SCS Authenticated Command Injection via 'shell ps'
    cvelistv5