Multiple race conditions in dom/media/systemservices/CamerasChild.cpp in the WebRTC implementation in Mozilla Firefox before 45.0 on Windows might allow remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.