VSFTPD 3.0.3 allows attackers to cause a denial of service due to limited number of connections allowed.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

• vsftpd < 3.0.3 - DoS network/cves/2021/CVE-2021-30047.yaml

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.