The US Computer Emergency Readiness Team advised RealPlayer users Friday to apply a new security update for the media-playing software.

The update, issued earlier this week, fixes 11 vulnerabilities in RealPlayer, and were issued for Windows, Mac and Linux versions of the product.

Although CERT thinks the patch is important, RealNetworks said in its advisory that it has received "no reports of any machines actually being compromised as a result of the now-remedied vulnerabilities."

RealPlayer has lost market share recently to rivals such as Windows Media Player and iTunes, but it is still widely used and has been exploited in past cyberattacks.