A NULL pointer dereference in the Win8ScreenDriver component allows an attacker to crash the server, resulting in a denial of service. This occurs when the re-initialization of the DXGI Desktop Duplication driver fails within the `applyNewScreenProperties()` function, such as after a GPU reset, display hot-plug, or session change. Consequently, the `m drvImpl` variable remains NULL and is dereferenced without validation by the functions `executeDetection()`, `getScreenBuffer()`, `grabFb()`, `getScreenPropertiesChanged()`, and `getCursorPosition()`.