CVE-2021-4189
5.3MEDIUMA 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. T
Publicado: 8/24/2022Actualizado: 12/17/2025
Descripción
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.
Análisis IAImpulsado por IA
Productos Afectados
pythonpython
pythonpython
pythonpython
pythonpython
pythonpython
3.10.0
debiandebian_linux
10.0
debiandebian_linux
11.0
redhatsoftware_collections
-
redhatenterprise_linux
8.0
netappontap_select_deploy_administration_utility
-
Referencias
- https://access.redhat.com/security/cve/CVE-2021-4189Third Party Advisory
- https://bugs.python.org/issue43285PatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020Issue TrackingPatchThird Party Advisory
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188ePatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://python-security.readthedocs.io/vuln/ftplib-pasv.htmlPatchThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4189Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0004/Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4189Third Party Advisory
- https://bugs.python.org/issue43285PatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2036020Issue TrackingPatchThird Party Advisory
- https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188ePatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://python-security.readthedocs.io/vuln/ftplib-pasv.htmlPatchThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4189Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0004/Third Party Advisory