Pre-authenticated RCE in EnOcean SmartServer IoT LON IP-852 message handling
CVE-2026-20761 is a pre-authentication remote command execution vulnerability affecting EnOcean SmartServer IoT version 4.60.009 and earlier, and reportedly legacy i.LON devices implementing the same IP-852/LonTalk functionality. The flaw is in handling of LON IP-852 management messages, specifically the timezone-setting path. According to the provided analysis, the vulnerable function is LtSetTimeZone in libLonStack.so, which constructs a shell command from a supplied timezone string and invokes system() with root privileges. LtSetTimeZone is reached from LtIpMaster::doRFCin while processing the proprietary PKTTYPE_ECHCONFIG (0xF3) packet. By sending a specially crafted IP-852 management message containing a malicious timezone value, a remote attacker can inject shell metacharacters and cause arbitrary OS command execution on the device.
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Exploits
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Recent activity
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A remote code execution vulnerability affecting EnOcean SmartServer and outdated i.LON devices caused by improper validation of packet input, enabling attackers to control arguments passed to a built-in system call and achieve root-level arbitrary code execution.
A pre-auth remote code execution vulnerability in EnOcean SmartServer IoT and legacy i.LON devices caused by improper validation of a timezone value in crafted IP-852/Echelon configuration packets, allowing arbitrary command execution as root.
A vulnerability in EnOcean SmartServer IoT (<= 4.60.009) where specially crafted LON IP-852 management messages can lead to arbitrary OS command execution.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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