The vulnerability scan shows that the version information is visible in the http-server-header, which can be exploited by attackers to identify vulnerabilities specific to that version. Removing or obfuscating this information can enhance security.
References: CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 4: Vulnerability Management, page 172; CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5: Vulnerability Management, page 223.