Sounds like the problem is on the Windows systems, not on CentOS. I can't help commenting that 5.3 is seriously obsolete and has numerous known bugs and security issues that have been fixed i... [by pschaff]
on 11/01/2010 – Made popular on 11/01/2010
First, you should immediately update to the current release 5.7. 5.4 is seriously obsolete and has numerous known bugs and security issues that have been fixed in subsequent updates. Obsolete relea... [by pschaff]
LinuxSecurity.com: Mozilla Firefox was upgraded to version 3.5.8, fixing various bugs and security issues. On openSUSE 11.0 and 11.1 Mozilla Firefox was updated to version 3.0.18. On openSUSE 11.2 Mozilla Seamonkey was updated to version 2.0.2.
Canonical published details about ClamAV vulnerabilities, in a security notice, for its Ubuntu 12.10, Ubuntu 12.04 LTS, Ubuntu 11.10, and Ubuntu 10.04 LTS operating systems. According to Canonical, several security issues were fixed in ClamAV.Felix Groebert, Mateusz Jurczyk and Gynvael Coldwind discovered multiple security issues with ClamAV.