CVE-2004-0051

CVE-2004-0051 describes a bypass vulnerability in multiple content security gateway and antivirus products, including Clearswift, F-Secure, and Paul L. Daniels offerings. Remote attackers can circumvent content restrictions by sending MIME messages with non-standard Content-Transfer-Encoding values like uuencode, mac-binhex40, or yenc, which mail clients may interpret differently. With a CVSS score of 7.5, this vulnerability is considered highly severe, allowing for network-based attacks with low complexity and potential impacts on confidentiality, integrity, and availability. The EPSS score is low, suggesting a minimal likelihood of exploitation in the wild. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE. It is not listed in the CISA KEV catalog.