CVE-2020-15205: In Tensorflow before versions 1.15.4, 2.0.3, 2.1.2, 2.2.1 and 2.3.1, the `data_splits` argument of `tf.raw_ops.StringNGr

TensorFlow versions before 1.15.4, 2.0.3, 2.1.2, 2.2.1, and 2.3.1 have a vulnerability in the `StringNGrams` function where the `data_splits` argument (a parameter controlling how input data is divided) is not properly checked. This lack of validation allows attackers to trigger a heap overflow (a memory error where data overwrites adjacent memory), potentially exposing sensitive data like return addresses that could help bypass ASLR (address space layout randomization, a security technique that randomizes where programs load in memory).