Snap, Drill, Bypass: Exposing Yet Another Euro Cylinder Lock Flaw

I’ve written before about how the Euro Cylinder lock faces some pretty serious security flaws in the form of being broken while still inside the lock, but today I am writing about a method of abusing a certain type of Euro Cylinder lock without the need for destruction.

Euro cylinder locks are found in doors across Europe offering convenience and a perceived level of security to users. While these locks have a diversity that includes dimple, standard pin tumbler, and other styles, they all share a common operating mechanism that in some cases can be easily bypassed with a cheap tool.

Today I am discussing the Euro Cylinder thumb turn lock. The thumb turn feature of these locks is particularly interesting. It's designed for ease of use, allowing the door to be locked and unlocked from the inside without a key. However, this convenience feature can be exploited using a tool that many might not consider in their security assessments—the Euro thumb turning bypass tool.