CVE-2004-0051: Multiple content security gateway and antivirus products allow remote attackers to bypass content restricti...

Security readout for executives and security teams

This CVE describes a way for email content filters or antivirus gateways to miss blocked content when an email uses unusual but mail-client-supported transfer encodings. The business risk is policy bypass in email security controls, not direct system takeover based on the provided sources. Exposure is most likely in organizations using legacy content security gateways, email antivirus systems, or custom mail filters that do not normalize MIME encodings before inspection. The source bundle does not identify specific affected vendors, products, versions, or CPEs. Treat this as a legacy email security assurance issue. It deserves attention if the organization still relies on older mail filtering infrastructure, but the provided evidence is insufficient to justify emergency response without vendor exposure confirmation. Mitigation focus: Check current vendor guidance for each deployed mail gateway or antivirus product.; Prioritize upgrades or replacement for unsupported legacy email filtering products.; Ensure mail filtering policies inspect content after MIME decoding and normalization..

Prepared

Jun 30, 2026, 02:43 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.