CVE-2026-23759 PUBLISHED

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

Assigner: VulnCheck
Reserved: 15.01.2026 Published: 17.03.2026 Updated: 17.03.2026

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.

Metrics

CVSS 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
CVSS Score: 8.6

Product Status

Vendor Perle Systems
Product IOLAN STS
Versions Default: unaffected
  • affected from 0 to 6.0 (excl.)
Vendor Perle Systems
Product IOLAN SCS
Versions Default: unaffected
  • affected from 0 to 6.0 (excl.)

Solutions

The vendor has stated that the IOLAN SCG and SCR models do not contain this vulnerable functionality.

Credits

  • Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp. finder
  • Omar Crespo, Pentester, GM Sectec, Corp. finder
  • VulnCheck coordinator

References

Problem Types

  • CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE