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According to advisories published by Siemens and the DHS’s Cybersecurity and Infrastructure Security Agency (CISA), SCALANCE X-200 switches are affected by a security hole that allows an unauthenticated attacker to cause a device to enter a DoS condition by repeatedly sending large message packets to the Telnet service.The vulnerability was reported to Siemens by industrial cybersecurity firm Nozomi Networks.

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