CVE-2026-20761
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary operating system commands on EnOcean SmartServer IoT devices by sending specially crafted IP-852 management messages. Affected systems include EnOcean SmartServer IoT version 4.60.009 and prior. This is a command injection vulnerability that could lead to complete device compromise.
💻 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
Complete device takeover leading to lateral movement within the network, data exfiltration, or disruption of industrial control systems.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or disrupt IoT operations.
If Mitigated
Limited impact if network segmentation and proper access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires crafting specific IP-852 messages but does not require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 4.60.010 or later
Vendor Advisory: https://enoceanwiki.atlassian.net/wiki/spaces/DrftSSIoT/pages/1475410/SmartServer+IoT+Release+Notes
Restart Required: Yes
Instructions:
1. Download latest firmware from EnOcean support portal. 2. Backup current configuration. 3. Apply firmware update via web interface or CLI. 4. Restart device. 5. Verify version is 4.60.010 or higher.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SmartServer devices in separate VLANs with strict firewall rules.
Access Control Lists
allImplement ACLs to restrict IP-852 traffic to trusted sources only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Deploy intrusion detection systems to monitor for IP-852 exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware 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 web interface System Information pageVerify Fix Applied:
Verify firmware version is 4.60.010 or higher and test IP-852 functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unusual IP-852 message patterns
- Unexpected process execution
- Failed command execution attempts
Network Indicators:
- Malformed IP-852 packets
- Unusual traffic to/from SmartServer ports
- Suspicious command strings in network traffic
SIEM Query:
source="smartserver" AND (message="*IP-852*" OR process="*sh*" OR command="*cmd*")🔗 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
