This indicates detection of an attempted web fuzzing on a server using the tool ffuf (Fuzz Faster U Fool) Web Fuzzer.
ffuf Web Fuzzer is used to probe web servers to see which systems are potentially vulnerable. An attacker may use the tool to identify that your system is vulnerable and perform further attacks based on its findings.
All web servers
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Monitor the traffic from that network for any suspicious activity.