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General Guidance from Cybersecurity & Infrastructure Security Agency (

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Immediate Actions to Protect Against Log4j Exploitation
• Discover all internet-facing assets that allow data inputs and use Log4j Java library anywhere in the stack.
• Discover all assets that use the Log4j library.
• Update or isolate affected assets. Assume compromise, identify common post-exploit sources and activity, and hunt for signs of malicious activity.
• Monitor for odd traffic patterns (e.g., JNDI LDAP/RMI outbound traffic, DMZ systems initiating outbound connections).


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