What’s Vulnerable › Vulnerabilities

CVE-2026-23759: Perle IOLAN STS/SCS Authenticated Command Injection via 'shell ps'

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-17 · updated 2026-06-17
• Weakness: CWE-78

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

• Perle Systems IOLAN SCS: before 6.0 — fixed in 6.0
• Perle Systems IOLAN STS: before 6.0 — fixed in 6.0

How to fix

Upgrade to a fixed version: Perle Systems IOLAN SCS 6.0; Perle Systems IOLAN STS 6.0. Check the vendor advisory for mitigations.

References

• https://www.perle.com/downloads/server_sds_sts_rackmount.shtml
• https://www.perle.com/support_services/documentation_pdfs/iolan_scs-sds-sts_ug.pdf
• https://www.vulncheck.com/advisories/perle-iolan-sts-scs-authenticated-command-injection-via-shell-ps

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