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Siemens SIMATIC S7 PLCs Web Server
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Siemens SIMATIC S7 PLCs Web Server
Siemens SIMATIC S7 programmable logic controller (PLC) web servers contain multiple cross-site scripting (XSS) and code injection vulnerabilities affecting numerous CPU models and variants across all versions. The vulnerabilities stem from improper validation and sanitization of trace files and signal data, potentially allowing execution of malicious JavaScript in authorized user sessions. Siemens is preparing fixes and recommends mitigations including disabling the web server when not required, restricting network access to ports 80 and 443, and limiting uploads to trusted trace files.
Why it matters: Organizations operating Siemens SIMATIC S7 PLCs with web servers enabled face risk of remote code execution and unauthorized PLC operations if users can be socially engineered into importing malicious trace files; OT/industrial control system teams must immediately assess deployments and implement access controls to mitigate exposure given the broad product scope and high CVSS scores.
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