What’s Vulnerable › Vulnerabilities

CVE-2021-47865: ProFTPD 1.3.7a - Remote Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-21 · updated 2026-06-17
• Weakness: CWE-770

Description

ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by creating multiple simultaneous FTP connections. Attackers can repeatedly establish connections using threading to exhaust server connection limits and block legitimate user access.

Affected products

• ProFTPD: 1.3.7a

References

• http://www.proftpd.org/
• https://github.com/proftpd/proftpd/issues/1298
• https://www.exploit-db.com/exploits/49697
• https://www.vulncheck.com/advisories/proftpd-a-remote-denial-of-service

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