A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which otherwise would not have been possible.
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Mon, 03 Nov 2025 22:30:00 +0000
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Status: PUBLISHED
Assigner: redhat
Published: 2022-08-24T00:00:00.000Z
Updated: 2025-11-03T21:45:21.395Z
Reserved: 2021-12-29T00:00:00.000Z
Link: CVE-2021-4189
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Status : Modified
Published: 2022-08-24T16:15:09.827
Modified: 2025-11-03T22:15:54.013
Link: CVE-2021-4189