Unchecked Return Value Affecting python36:3.6/python-sqlalchemy-doc package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.3% (54th percentile)

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  • Snyk IDSNYK-RHEL8-PYTHON36-5242191
  • published5 Nov 2025
  • disclosed21 Dec 2021

Introduced: 21 Dec 2021

CVE-2021-4189  (opens in a new tab)
CWE-252  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 python36:3.6/python-sqlalchemy-doc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python36:3.6/python-sqlalchemy-doc package and not the python36:3.6/python-sqlalchemy-doc package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1