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CVE-2026-116844— Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT P

Quick assessment

Affected
fclairamb ftpserverlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fclairamb 的 ftpserverlib 库（版本 0.32.4 及更早版本）存在明文传输漏洞。该漏洞源于 函数仅检查由 PROT 命令设置的 标志，而未验证已建立的数据连接是否实际启用了 TLS。当客户端在发送 PASV 或 PORT 命令后使用 PROT P 时，即使已配置强制加密，文件内容和目录列表仍会以明文形式在网络中传输，使得路径上的攻击者能够窃听或篡改这些数据。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port
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I. Basic Information for CVE-2026-116844

Vulnerability Information
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Vulnerability Title
Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT P
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fclairamb ftpserverlib 0 ~ 0.32.4 -

II. Public POCs for CVE-2026-116844

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III. Intelligence Information for CVE-2026-116844

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Patches & Fixes for CVE-2026-116844 (1)

Vendor Advisories for CVE-2026-116844 (1)

Proof of Concept for CVE-2026-116844 (1)

IV. Related Vulnerabilities

Same weakness: CWE-319