Mcafee VirusScan 4.03 does not properly restrict access to the alert text file before it is sent to the Central Alert Server, which allows local users to modify alerts in an arbitrary fashion.

The default configurations for McAfee Virus Scan and Norton Anti-Virus virus checkers do not check files in the RECYCLED folder that is used by the Windows Recycle Bin utility, which allows attackers to store malicious code without detection.

NAI VirusScan NT 4.0.2 does not properly modify the scan.dat virus definition file during an update via FTP, but it reports that the update was successful, which could cause a system administrator to believe that the definitions have been updated correctly.