Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
Analyze the vulnerability-scan report `scan_results/nmap_scan.nmap`. Most Nmap NSE `vuln` results are `NOT VULNERABLE` or informational decoys, but exactly one is `State: VULNERABLE (Exploitable)`. Read the `FLAG:` line in that confirmed-vulnerable service's block (the AJP Ghostcat / CVE-2020-1938 service).
Review the NSE vuln script results in nmap_scan.nmap; most are NOT VULNERABLE or informational decoys
There is exactly one State: VULNERABLE (Exploitable)
The flag (FLAG:) is in that confirmed-vulnerable service's block