CVE-2026-116844
Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT P
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 27, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 27, 2026
Description
Fclairamb ftpserverlib through 0.32.4 contains a cleartext transmission vulnerability because TransferOpen checks only the transferTLS flag set by PROT, not whether the prepared data connection uses TLS. When a client sends PROT P after PASV or PORT, file contents and directory listings cross the network unencrypted, even with mandatory encryption, letting on-path attackers read or modify them.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-319 Cleartext Transmission of Sensitive Information
Affected Products
| Product | Versions |
|---|---|
ftpserverlibfclairamb |
|
Syncplify Server!Syncplify, Inc. |
|
References
- https://github.com/fclairamb/ftpserverlib/pull/685patchissue-tracking
- https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31technical-description
- https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720technical-description
- VulnCheck Advisory: Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT Pthird-party-advisory
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