RealNetworks, Inc. Releases Update to Address Security Vulnerabilities.
Updated June 23, 2005
RealNetworks, Inc. has addressed recently discovered security vulnerabilities that offered the potential for an attacker to run arbitrary or malicious code on a customer's machine. RealNetworks has received no reports of machines compromised as a result of the now-remedied vulnerabilities. RealNetworks takes all security vulnerabilities very seriously.
This link will tell you more as to the versions affected and directions for specific versions.