Virus Scan software from multiple vendors contains a flaw that may allow a remote attacker to bypass SMTP content filters. The problem is that the antivirus gateways fail to reassemble and scan mail messages, if they are sent in the message/partial format. It is possible that the flaw may allow malicious files to bypass antivirus gateways, resulting in a loss of integrity.
Remote / Network Access
Loss of Integrity
Consult your vendor for upgrades. An upgrade is required as there are no known workarounds.