Here is the description excerpt of GlyphPatch Cydia tweak:
On Aug 29th, 2013, a DoS (Denial of Service) exploit targeting iOS / OS X was disclosed. This exploit is based on a vulnerability affecting iOS / OS X characters rendering engines: this tweak aims to patch that vulnerability in order to protect the user from this kind of attacks, since the exploit can be triggered through different surfaces (SMS, iMessage, web, network SSID).This isn’t quite easy to understand, but the developer did mentioned a long explanation of what the exploit is about.
If this bug has been bothering you for a while, GlypPatch Cydia tweak can lessen your woes. It’s simple to use and gets immediately activated upon installation without any configuration.
You can download it from Cydia’s BigBoss repo. Mac users have to wait a while because the Mac version is still being worked upon.