Security experts discovered over 600 new vulnerabilities and web-based threats in the first three months of 2005, according to the Sans Institute.
Although fixes for the flaws have been made available in most cases, the security watchdog warned that many systems remain unpatched.
"These critical vulnerabilities are widespread and many of them are being exploited right now in our homes and offices," said Alan Paller, research director at the Sans Institute.
The Institute's updated Top 20 Internet Security Vulnerabilities list can be seen here. All the flaws are characterised as 'critical'.
The media players are all susceptible to buffer overflow attacks. Users could be infected by visiting a website containing malicious code. The flaw affects Windows and Mac OS users.
The antivirus flaws could offer a backdoor into a system that allows hackers to take remote control.
The list included two vendors of enterprise applications. Oracle had to patch vulnerabilities in its database server, application server, E-business Suite and Collaboration Suite that would allow remote users access to information and control of databases.
Computer Associates suffered a security vulnerability in its Licence Package that put several of the vendor's software products at risk from a buffer overflow attack.
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