[CentOS] PHP vulnerability CVE-2016-4073

Hello,

My server with CentOS 6.8 just failed PCI scan, so I'm looking into
vulnerable packages. PHP 5.3.3 have multiple vulnerabilities, some of
them are fixed/patched or have some kind of workaround. But I can't find
a way to fix this one. Red Hat state: under investigation.

https://access.redhat.com/security/cve/cve-2016-4073

This CVE is 6 months old, and it doesn't look like it will be fixed.
Does anyone knows the way to go around this? Except blocking mb_strcut()
function.

Thanks!