CVE-2003-0121

CVE-2003-0121 describes a vulnerability in Clearswift MAILsweeper 4.x that allows remote attackers to bypass attachment detection. This bypass occurs when an attachment lacks a MIME-Version header, which some mail clients still process, enabling malicious content to circumvent security filters. The vulnerability has a CVSS score of 7.5, indicating high severity with network-based exploitation, low attack complexity, and potential for partial compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or inclusion in the KEV catalog, public exploit code exists via ExploitDB, though community discussion and media coverage are minimal.