Cisco Unified Callstudio 12.5 Log4j Vulnerability Patch Installation Step 1 Close all Callstudio applications. Step 2 unzip the Callstudio_12.5_Log4j_fix.zip file to get the log4j-api and log4j-core jar files Step 3 Copy the provided log4j-api and log4j-core jar files to below mentioned locations: Note: Before copying please take a backup of existing log4j-api and log4j-core jar files. C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.library.common\lib C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.library.framework\lib C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.debug.core\lib C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.debug.runtime\CATALINA_HOME\webapps\CVP\WEB-INF\lib C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.builder.documenter\lib C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.extensionkit.core\lib