CVE-2021-47865

HIGH

ProFTPD 1.3.7a - Denial of Service via Multiple Simultaneous FTP Connections

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47865. PoCs published by xynmaps.

AI-analyzed exploit summary This exploit performs a Denial of Service (DoS) attack against ProFTPD 1.3.7a by flooding the server with multiple FTP connections, exhausting its connection limit. It uses threading to spawn multiple FTP processes and includes a timer to restart the attack periodically.

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.

Exploits (1)

exploitdb WORKING POC
by xynmaps · pythondosmultiple
https://www.exploit-db.com/exploits/49697

This exploit performs a Denial of Service (DoS) attack against ProFTPD 1.3.7a by flooding the server with multiple FTP connections, exhausting its connection limit. It uses threading to spawn multiple FTP processes and includes a timer to restart the attack periodically.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: ProFTPD 1.3.7a
No auth needed
Prerequisites: Network access to the target ProFTPD server · FTP port (default 21) open and accessible
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/49697
Various Sources product
http://www.proftpd.org/
Issue Tracking issue-tracking
https://github.com/proftpd/proftpd/issues/1298

Scores

CVSS v3 7.5
EPSS 0.0054
EPSS Percentile 41.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (1)
ProFTPD/ProFTPD 1.3.7a
Published Jan 21, 2026
Tracked Since Feb 18, 2026