CVE-2004-0400

CVE-2004-0400 describes a stack-based buffer overflow vulnerability in Exim 4, specifically versions prior to 4.33, when the headers_check_syntax option is enabled. This flaw allows unauthenticated remote attackers to trigger a denial of service and potentially execute arbitrary code by sending specially crafted email headers. With a CVSS score of 7.5, this vulnerability is considered highly severe due to its network-based attack vector and low attack complexity, potentially leading to partial confidentiality, integrity, and availability compromise. Despite its age and severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.