CVE-1999-1553

CVE-1999-1553 describes a critical buffer overflow vulnerability in XCmail version 0.99.6, specifically when the autoquote feature is enabled. This flaw allows unauthenticated remote attackers to execute arbitrary commands on affected systems by crafting an excessively long subject line in an email. With a CVSS score of 10.0, this vulnerability poses a high risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation in the wild, a local buffer overflow exploit for this vulnerability is publicly available on ExploitDB, and there is no community discussion or media coverage surrounding it.