CVE-2025-26389
📋 TL;DR
This critical vulnerability allows unauthenticated remote attackers to execute arbitrary code with root privileges on affected OZW672 and OZW772 devices. Attackers can exploit improper input sanitization in the exportDiagramPage endpoint to gain complete control of vulnerable systems. All organizations using these devices with versions below V8.0 are affected.
💻 Affected Systems
- OZW672
- OZW772
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install persistent backdoors, exfiltrate sensitive data, pivot to internal networks, or disrupt industrial operations.
Likely Case
Attackers gain root access to vulnerable devices, enabling data theft, lateral movement, and potential disruption of connected systems.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated device compromise without network-wide consequences.
🎯 Exploit Status
OS command injection vulnerability with root privileges, making exploitation straightforward once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V8.0 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-047424.html
Restart Required: Yes
Instructions:
1. Download firmware V8.0 or later from Siemens support portal. 2. Backup device configuration. 3. Apply firmware update following vendor documentation. 4. Verify successful update and restore configuration if needed.
🔧 Temporary Workarounds
Network Access Restriction
linuxBlock all external access to affected devices using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Endpoint Disablement
allDisable the vulnerable exportDiagramPage endpoint if possible
🧯 If You Can't Patch
- Immediately isolate affected devices in dedicated VLAN with strict access controls
- Implement network-based intrusion detection to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is below V8.0, device is vulnerable.Check Version:
Check via web interface at /status or use vendor-specific CLI commands for version verificationVerify Fix Applied:
Confirm firmware version is V8.0 or higher and test that exportDiagramPage endpoint properly sanitizes input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to exportDiagramPage endpoint
- Unexpected process execution or system commands in logs
- Failed authentication attempts followed by successful exploitation
Network Indicators:
- HTTP requests containing shell metacharacters in parameters
- Outbound connections from devices to unknown external IPs
- Unusual traffic patterns from industrial devices
SIEM Query:
source="device_logs" AND (uri="*exportDiagramPage*" AND (param="*;*" OR param="*|*" OR param="*`*"))