CVE-2026-23759Network attack vector

Authenticated root command execution via shell ps

Published Mar 17, 2026 · Updated Mar 17, 2026

OS command injection in Perle IOLAN STS and SCS firmware before 6.0 allows remote authenticated users to execute commands as root. The restricted shell's ps command passes unsanitized arguments containing shell metacharacters to a root-level sh -c invocation. Access requires a valid device login over Telnet or SSH, after which injected commands can fully control the underlying operating system.

CVSS severity8.6
High
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Perle IOLAN STS and SCS firmware before 6.0 allows remote authenticated users to execute commands as root. The restricted shell's ps command passes unsanitized arguments containing shell metacharacters to a root-level sh -c invocation. Access requires a valid device login over Telnet or SSH, after which injected commands can fully control the underlying operating system.

The record

CVE
CVE-2026-23759
Published
Mar 17, 2026
Updated
Mar 17, 2026
Vendor
Perle Systems
Product
IOLAN STS
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Perle Systems · IOLAN STSversion=0 <6.0
Perle Systems · IOLAN SCSversion=0 <6.0

Published CVSS scores

7.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.6VulnCheckCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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