CVE-2026-22885
📋 TL;DR
A memory leak vulnerability in EnOcean SmartServer IoT versions 4.60.009 and prior allows remote attackers to send specially crafted LON IP-852 management messages, causing the program to gradually consume more memory. This affects organizations using EnOcean SmartServer IoT devices for building automation and industrial control systems.
💻 Affected Systems
- EnOcean SmartServer IoT
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Sustained exploitation could lead to complete memory exhaustion, causing the SmartServer IoT device to crash or become unresponsive, potentially disrupting building automation or industrial control operations.
Likely Case
Gradual performance degradation over time as memory is consumed, leading to slower response times or intermittent service interruptions.
If Mitigated
With proper network segmentation and monitoring, impact is limited to potential performance issues that can be detected and addressed before service disruption.
🎯 Exploit Status
Exploitation requires knowledge of LON IP-852 protocol and ability to craft specific malformed messages. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.60.009
Vendor Advisory: https://enoceanwiki.atlassian.net/wiki/spaces/DrftSSIoT/pages/1475410/SmartServer+IoT+Release+Notes
Restart Required: Yes
Instructions:
1. Check current version using version check command. 2. Download latest firmware from EnOcean support portal. 3. Follow vendor's firmware update procedure. 4. Restart device after update. 5. Verify update was successful.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to LON IP-852 management port (typically 1628/tcp) to trusted management networks only
iptables -A INPUT -p tcp --dport 1628 -s TRUSTED_NETWORK -j ACCEPT
iptables -A INPUT -p tcp --dport 1628 -j DROP
Rate Limiting
linuxImplement rate limiting on LON IP-852 traffic to prevent rapid memory consumption
iptables -A INPUT -p tcp --dport 1628 -m limit --limit 10/min --limit-burst 20 -j ACCEPT
iptables -A INPUT -p tcp --dport 1628 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SmartServer IoT devices from untrusted networks
- Deploy network monitoring to detect abnormal LON IP-852 traffic patterns and memory usage spikes
🔍 How to Verify
Check if Vulnerable:
Check device version via web interface or SSH. If version is 4.60.009 or lower, device is vulnerable.Check Version:
ssh admin@device_ip 'cat /etc/version' or check via web interface at http://device_ip/statusVerify Fix Applied:
After update, verify version is higher than 4.60.009 and monitor memory usage during normal LON IP-852 traffic.📡 Detection & Monitoring
Log Indicators:
- Unusual memory consumption patterns in system logs
- Repeated LON IP-852 connection attempts from unusual sources
- Process restart events for SmartServer services
Network Indicators:
- High volume of LON IP-852 traffic to port 1628/tcp
- LON IP-852 messages with malformed structure or unusual patterns
SIEM Query:
source="smartserver.log" ("memory" AND ("high" OR "exhausted" OR "leak")) OR dest_port=1628 AND protocol="LON"🔗 References
- https://enoceanwiki.atlassian.net/wiki/spaces/DrftSSIoT/pages/1475410/SmartServer+IoT+Release+Notes#Current-Stable-Release
- https://enoceanwiki.atlassian.net/wiki/spaces/IEC/pages/288063529/Enhancing+Security
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-050-01.json
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-050-01
