{"id":"CVE-2026-116844","published":"2026-10-27T01:19:07.887","lastModified":"2026-10-27T01:19:07.887","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.","cvssScore":4.8,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cwes":["CWE-319"],"vendors":[],"products":[],"references":[{"url":"https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720","tags":[]},{"url":"https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31","tags":[]},{"url":"https://github.com/fclairamb/ftpserverlib/pull/685","tags":[]},{"url":"https://www.vulncheck.com/advisories/fclairamb-ftpserverlib-through-0.32.4-cleartext-ftpes-data-transfer-via-prot-p","tags":[]}],"exploitRefs":[{"url":"https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720","tags":[]},{"url":"https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31","tags":[]},{"url":"https://github.com/fclairamb/ftpserverlib/pull/685","tags":[]}],"hasPoc":true,"ai":null}