CVE-2026-20761Network attack vector

Root command execution via insufficiently escaped timezone string

Published Feb 20, 2026 · Updated Feb 20, 2026

Command injection in EnOcean SmartServer IoT 4.60.009 and earlier allows remote attackers to execute arbitrary OS commands as root. The LtSetTimeZone function in libLonStack.so inserts an IP-852 timezone value into a shell command and passes it to system without neutralizing quote-breaking input. No authentication or user interaction is required when IP-852 packets are enabled; a crafted private-configuration packet grants full control of the Linux controller and its building-management functions.

CVSS severity8.1
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in EnOcean SmartServer IoT 4.60.009 and earlier allows remote attackers to execute arbitrary OS commands as root. The LtSetTimeZone function in libLonStack.so inserts an IP-852 timezone value into a shell command and passes it to system without neutralizing quote-breaking input. No authentication or user interaction is required when IP-852 packets are enabled; a crafted private-configuration packet grants full control of the Linux controller and its building-management functions.

The record

CVE
CVE-2026-20761
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
EnOcean
Product
SmartServer IoT
Classifications
CWE-77, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=4.60.009

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EnOcean · SmartServer IoTversion=0 <=4.60.009

Published CVSS scores

8.1ICS-CERTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell
T1190Exploit Public-Facing Application

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo