CVE-2004-0221

CVE-2004-0221 is a denial-of-service vulnerability affecting isakmpd in OpenBSD 3.4 and earlier versions. Remote attackers can crash the system by sending a specially crafted ISAKMP packet containing a delete payload with an excessive number of Security Parameter Indexes (SPIs), leading to an out-of-bounds read error. This vulnerability has a CVSS score of 5.0, indicating a medium severity with low attack complexity and no authentication required, resulting in a partial availability impact. There is no evidence of active exploitation, nor are there publicly available exploits in Metasploit or ExploitDB, though it has garnered significant community discussion.