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CVE-2021-4189 is a flaw in Python's FTP client library (ftplib) when operating in passive (PASV) mode. The client trusted the IP address returned by the server in the PASV response instead of restricting the data connection to the actual peer address of the FTP server. As a result, a malicious FTP server could supply an arbitrary host and port in the PASV response and induce the client to connect to that attacker-chosen endpoint. The issue is a protocol trust/logic flaw in PASV handling rather than a memory-safety bug, and it can be abused for FTP bounce-style behavior and server-side request forgery against arbitrary network targets reachable by the client.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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