Symantec Scan Engine 5.0.0.24, and possibly other versions before 5.1.0.7, uses the same private DSA key for each installation, which allows remote attackers to conduct man-in-the-middle attacks and decrypt communications.
Buffer overflow in Symantec Norton AntiVirus 2002 allows remote attackers to execute arbitrary code via an e-mail attachment with a compressed ZIP file that contains a file with a long filename.