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Siemens Notifies Customers of Microsoft Defender Antivirus Issue

Posted on June 24, 2025June 24, 2025 By CWS

Siemens knowledgeable clients on Tuesday that it’s working with Microsoft to deal with a problem associated to Microsoft Defender Antivirus (MDAV) and Simatic PCS merchandise. 

In keeping with the advisory printed by the economic big, the issue is that Defender Antivirus at present doesn’t present ‘alert solely’ performance. 

Siemens’ documentation for Simatic PCS 7 and PCS Neo course of management methods describes Microsoft Defender Antivirus configurations for specifying risk alert ranges at which no default motion is taken when a risk is detected. 

The issue is that if the product is about to ‘ignore’, then no motion is taken and no alert is generated for the plant operator and administrator when malware is detected. 

If a distinct setting is used, Defender Antivirus could delete or quarantine information flagged as potential malware (each true and false positives), which might result in disruptions if the system is counting on the possibly contaminated file.

“The outcome may very well be that affected units won’t work anymore, which might result in lack of monitoring and management of the plant,” Siemens defined.

Till the corporate works out an answer with Microsoft, plant managers counting on Simatic PCS are suggested to conduct a threat evaluation to find out whether or not they wish to be alerted about malware infections, or threat disruptions if the antivirus deletes probably vital information.

Clients can cluster impacted units and apply totally different configurations to every cluster relying on their wants and necessities. Commercial. Scroll to proceed studying.

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Security Week News Tags:Antivirus, Customers, Defender, Issue, Microsoft, Notifies, Siemens

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