This document provides release notes for ArcSight ESM Version 6.5c Patch 1. The patch addresses critical issues in ESM 6.5c, provides updates for geographical information and vulnerability mapping, and includes instructions for installing the patch for the ESM main components and ArcSight Console. Issues fixed in the patch include issues with the CORR_Engine and Analytics. The release notes also describe open issues in the patch and issues closed in ESM 6.5c.