CVE-2021-47865
High · 7.5CVSS
7.5
EPSS
0.6%
Published
Jan 21, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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