CVE-2020-15203: In Tensorflow before versions 1.15.4, 2.0.3, 2.1.2, 2.2.1 and 2.3.1, by controlling the `fill` argument of tf.strings.as

TensorFlow versions before 1.15.4, 2.0.3, 2.1.2, 2.2.1, and 2.3.1 contain a format string vulnerability (a bug where attackers can manipulate how data is printed to cause crashes) in the tf.strings.as_string function. By controlling the `fill` argument, an attacker can trigger a segmentation fault (a crash caused by accessing invalid memory).