VDB
BIT-python-min-2021-4189
BIT-python-min-2021-4189
PUBLISHED
CVSS 5.300000190734863 MEDIUM
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.
Risk Scores
CVSS 3.1
5.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bitnami | python-min | 3.6.0, 3.7.0, 3.8.0 |
Exploit Intelligence
- zephyr-crosstool-arm-grype.html (github-poc)
Timeline
- Jan 16, 2025 CVE Published
- Nov 6, 2025 CVE Updated
References
- https://access.redhat.com/security/cve/CVE-2021-4189 url
- https://bugs.python.org/issue43285 url
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020 url
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e url
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html url
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html url
- https://python-security.readthedocs.io/vuln/ftplib-pasv.html url
- https://security-tracker.debian.org/tracker/CVE-2021-4189 url
- https://security.netapp.com/advisory/ntap-20221104-0004/ url
- https://nvd.nist.gov/vuln/detail/CVE-2021-4189 url
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html url