In affected versions of TensorFlow running an LSTM/GRU model where the LSTM/GRU layer receives an input with zero-length results in a CHECK failure when using the CUDA backend. This can result in a query-of-death vulnerability via denial of service if users can control the input to the layer. This is fixed in versions 1.15.5 2.0.4 2.1.3 2.2.2 2.3.2 and 2.4.0.