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WAGO: Multiple product series affected by multiple CODESYS vulnerabilities

Act Now9.8VDE-2022-035Aug 17, 2022
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Multiple WAGO product families (CC100, EC300, PFC 100, PFC 200, TP600) contain multiple critical vulnerabilities in the CODESYS control runtime system. The vulnerabilities include buffer overflow (CWE-787), missing input validation (CWE-20), null pointer dereference (CWE-476), and improper access control (CWE-345). An unauthenticated attacker with network access can exploit these flaws to execute arbitrary code on affected controllers without user interaction or credentials, potentially gaining complete control over control system functions.

What this means
What could happen
Multiple vulnerabilities in WAGO controllers running CODESYS allow an unauthenticated attacker on the network to execute arbitrary code, potentially altering process logic, stopping production lines, or corrupting control system data without any credentials or user interaction.
Who's at risk
Water utilities and municipal electric distribution operators using WAGO PFC 100, PFC 200, TP600, or CC100 controllers in SCADA/automation systems. Any facility relying on these controllers for real-time process control, pump operation, valve actuation, or power distribution logic is affected.
How it could be exploited
An attacker on the network sends a specially crafted network packet to the affected WAGO controller. The CODESYS runtime processes the malformed input due to buffer overflow (CWE-787) or missing input validation (CWE-20), allowing the attacker to write arbitrary code to memory. The attacker then executes commands on the controller to manipulate control logic or halt operations.
Prerequisites
  • Network access to the WAGO controller on the port where CODESYS runtime listens (typically port 11740 or web interface ports)
  • No authentication required
  • Controller must be running vulnerable firmware version
remotely exploitableno authentication requiredlow complexityhigh CVSS (9.8)high EPSS scoreno patch available for CC100 and EC300 as of advisory dateaffects industrial automation and critical infrastructure
Affected products (5)
4 with fix1 EOL
ProductAffected VersionsFix Status
PFC 200≤ 03.09.05(21)03.10.08(22)
TP600≤ 03.07.14(19)03.10.09(22)
CC100≤ 03.09.07(21)03.10.09(22)
EC300≤ 03.07.14(19)No fix (EOL)
PFC 100≤ 03.09.05(21)03.10.08(22)
Remediation & Mitigation
0/6
Do now
0/3
WORKAROUNDImplement firewall rules to restrict network access to CODESYS runtime ports (port 11740 and web interface) to only authorized engineering workstations and management networks
HARDENINGDisable remote access to controllers unless absolutely required; if remote access is needed, use VPN tunnels with encryption
HARDENINGEnable and enforce user authentication and strong passwords on all CODESYS projects and controller access
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

PFC 200
HOTFIXUpdate PFC 100 and PFC 200 controllers to firmware version 03.10.08(22) or later
TP600
HOTFIXUpdate TP600 and CC100 controllers to firmware version 03.10.09(22) or later
Mitigations - no patch available
0/1
EC300 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate control system networks from corporate networks and the internet
View full CERT@VDE advisory
API: /api/v1/advisories/af86b04a-0b95-473d-ba97-ec0e1702e159
WAGO: Multiple product series affected by multiple CODESYS vulnerabilities | CVSS 9.8 - OTPulse