DETECTING PENETRATION ATTEMPTS USING LOG-SENSITIVE FUZZING

Techniques and systems are provided for detecting penetration attempts with fuzzing techniques utilizing historical log data of target system. The techniques may, for example, include comparing logs captured in response to fuzzed inputs with large numbers of historical logs and then modifying how the inputs are fuzzed based on how the fuzzed inputs resulting in a high similarity score were fuzzed. In some implementations, historical logs and captured logs with high similarity scores may cause an alarm condition to be triggered to alert a human operator.