CVE-2012-4423

CVE-2012-4423 describes a denial-of-service vulnerability in libvirt versions prior to 0.10.2, specifically affecting the virNetServerProgramDispatchCall function, which is present in products like Red Hat libvirt. An unauthenticated remote attacker can trigger a NULL pointer dereference and segmentation fault by sending a crafted RPC call with an event as the RPC number or an RPC number within a dispatch table gap. This vulnerability has a CVSS score of 5.0, indicating a medium severity with low attack complexity and no authentication required, leading to partial availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.