CVE-2021-47865
ProFTPD 1.3.7a - Remote Denial of Service
- State
- Published
- Severity
- 8.7 High
- Published
- Jan 21, 2026
- Updated
- Apr 7, 2026
- Reserved
- Jan 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
ProFTPDProFTPD |
|
References
- ExploitDB-49697exploit
- ProFTPD Official Websiteproduct
- ProFTPD GitHub Repositoryissue-tracking
- VulnCheck Advisory: ProFTPD 1.3.7a - Remote Denial of Servicethird-party-advisory
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