Summary Actions Critical Infrastructure Organizations Should Implement to Immediately Strengthen Their Cyber Posture.• Patch all systems. Prioritize patching known exploited vulnerabilities.• Implement multi-factor authentication.• Use antivirus software.• Develop internal contact lists and surge support. Note: this advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, version 10. See the ATT&CK for Enterprise for …