CISA has published an advisory on an uncontrolled resource consumption vulnerability in Siemens SIMATIC S7-200 SMART CPU family. Versions 2.2 and later, prior to v2.5.1, are affected. Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition. Siemens recommends users update to v2.5.1 and limit network access to device to trusted sources. CISA also recommends a series of measures to mitigate the vulnerability. Access the advisory at CISA.