The issue is related to an integer overflow in the `freerdp bitmap planar context reset` function, leading to a heap-buffer overflow. This affects FreeRDP based clients, while FreeRDP based server implementations and proxy are not affected. A malicious server could prepare a `RDPGFX RESET GRAPHICS PDU` to allocate too small buffers, possibly triggering later out of bound read/write. The buffers are used to display an image, and data extraction over the network is not possible.