At Dec-12 01:43:06UTC, they released PHP5.5.7.
According to ( ChangeLog ), it fixes some bugs against PHP 5.5.6, and especially includes the fix for CVE-2013-6420.
I downloaded a Thread Safe version php-5.5.7-Win32-VC11-x86.zip for my server (Windows7HP+SP1(x86)). It requires VC11. If you don’t have VC11 on your Windows, you must install vcredist_x__.exe before the PHP configuration.
The php.ini-production has nothing changed.
As the official PHP binary includes php5apache2_4.dll, I extract the zip archive and replace all PHP5.5.6 files with all PHP5.5.7 files except my php.ini. Then, I restart my Apache. That’s it.
If you need how to configure PHP5.5, please see the post. It is for a mbstrings user, but the information gives some help for you.