CVE-2024-11737
📋 TL;DR
An unauthenticated attacker can send specially crafted Modbus packets to Schneider Electric controllers, causing denial of service and potentially compromising confidentiality and integrity. This affects Schneider Electric Modicon and EcoStruxure controllers with improper input validation. Industrial control systems using these vulnerable devices are at risk.
💻 Affected Systems
- Schneider Electric Modicon controllers
- Schneider Electric EcoStruxure controllers
⚠️ 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 controller compromise allowing attackers to disrupt industrial processes, steal sensitive operational data, and potentially cause physical damage or safety incidents.
Likely Case
Denial of service attacks disrupting controller operations and potential data exfiltration from industrial networks.
If Mitigated
Limited impact with proper network segmentation and access controls preventing unauthorized Modbus traffic.
🎯 Exploit Status
Exploitation requires sending crafted Modbus packets, which is straightforward with network access to the controller.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Consult vendor advisory SEVD-2024-345-03 for specific patched versions
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2024-345-03&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2024-345-03.pdf
Restart Required: Yes
Instructions:
1. Review Schneider Electric advisory SEVD-2024-345-03
2. Identify affected controller models and versions
3. Download and apply firmware updates from Schneider Electric
4. Restart controllers after patching
5. Verify patch application and functionality
🔧 Temporary Workarounds
Network Segmentation
allIsolate controllers in dedicated industrial network segments with strict firewall rules
Modbus Access Control
allImplement network access controls to restrict Modbus traffic to authorized sources only
🧯 If You Can't Patch
- Implement strict network segmentation with industrial firewalls blocking all unauthorized Modbus traffic
- Deploy intrusion detection systems monitoring for anomalous Modbus packets and connection attempts
🔍 How to Verify
Check if Vulnerable:
Check controller firmware version against patched versions listed in Schneider Electric advisory SEVD-2024-345-03Check Version:
Controller-specific command varies by model; typically accessed through engineering software or web interfaceVerify Fix Applied:
Verify firmware version matches patched version from vendor advisory and test Modbus functionality📡 Detection & Monitoring
Log Indicators:
- Unusual Modbus traffic patterns
- Multiple failed Modbus connection attempts
- Controller restart or crash logs
Network Indicators:
- Malformed Modbus packets
- Modbus traffic from unauthorized sources
- Unusual Modbus function codes
SIEM Query:
source:industrial_network AND protocol:modbus AND (packet_size:anomalous OR src_ip:not_in_whitelist)