CVE-2021-47865
HIGH EPSS 41.2%
Published Jan 21, 20265mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
Published Jan 21, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
41.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-770
References 4
- proftpd.org http://www.proftpd.org/
- github.com https://github.com/proftpd/proftpd/issues/1298
- exploit-db.com https://www.exploit-db.com/exploits/49697
- vulncheck.com https://www.vulncheck.com/advisories/proftpd-a-remote-denial-of-service
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.