RCE in Perle Systems Iolan Scs
CVE-2026-23759
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.015 (71.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Perle Systems Iolan Scs — versions 0
- Perle Systems Iolan Sts — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-23759?
- CVE-2026-23759 is a high-severity vulnerability in Perle Systems Iolan Scs, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-03-17.
- How severe is CVE-2026-23759?
- High severity. CVSS v3 base score is 7.2 out of 10.