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Vulnerability · NVD

CVE-2021-4189

CVE-2021-4189, medium severity (CVSS 5.3): 3 tracked apps concerned, all fixed or indeterminable on their current version.

Severity (CVSS)
5.3

NVD scale

Exploitation
3.2 %

EPSS, predicted over 30 days

Tracked apps
3
Still exposed
0

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.

Attack vector : Network No privileges required No user interaction
Show raw CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS 3.20% above median percentile 87.6%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

  • Python 3.12 Windows winget:Python.Python.3.12
    Affected ≥3.6.0 <3.6.14 Fixed in 3.6.14 Latest tracked 3.12.10 patched
  • Python 3.13 Windows winget:Python.Python.3.13
    Affected ≥3.6.0 <3.6.14 Fixed in 3.6.14 Latest tracked 3.13.15 patched
  • Python 3.14 Windows winget:Python.Python.3.14
    Affected ≥3.6.0 <3.6.14 Fixed in 3.6.14 Latest tracked 3.14.7 patched
Vulnerable CPE configurations (5)
Vendor Product Versions
python python
All platforms (wildcard)
 ≥3.6.0 <3.6.14
python python
All platforms (wildcard)
 ≥3.7.0 <3.7.11
python python
All platforms (wildcard)
 ≥3.8.0 <3.8.9
python python
All platforms (wildcard)
 ≥3.9.0 <3.9.3
python python
All platforms (wildcard)
 -
View on NVD ↗ Advisory · bugs.python.org Advisory · bugzilla.redhat.com Advisory · github.com

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