CVE-2026-116844
Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT P
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-319 |
| Vendor | fclairamb |
| Product | ftpserverlib |
| Published | Oct 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
fclairamb / ftpserverlib
0 ≤ 0.32.4
References
github.com: https://github.com/fclairamb/ftpserverlib/pull/685 github.com: https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31 github.com: https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720 vulncheck.com: https://www.vulncheck.com/advisories/fclairamb-ftpserverlib-through-0.32.4-cleartext-ftpes-data-transfer-via-prot-p
Credits
Che Agg Truvat drakkan