CVE-2021-4189General(debian / debian_linux)

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

1.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-252

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • debian_linux
  • enterprise_linux
  • ontap_select_deploy_administration_utility
  • python

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • General: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Products
debian_linuxenterprise_linuxontap_select_deploy_administration_utilitypythonsoftware_collections

5 versions affected across 5 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-13: 1Technical Details · 2026-05-13: 105-13
Signal classification1 categories
General
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    General

    CVE-2026-8328 The ftpcp() function in Lib/ftplib.py was not updated when CVE-2021-4189 was fixed. While makepasv() was patched to replace server-supplied PASV host addresses with t… https://www.cve.org/CVERecord?id=CVE-2026-8328

    Post summary

    The text merely notes that the ftpcp() function was omitted during a previous fix, referencing CVE-2026‑8328.

    00000137
    57.5K followersView on X
CPE platform detail7 entries

7 of 7 entries

PartVendorProductVersionTarget SWTarget HW
OSdebiandebian_linux10.0--
OSdebiandebian_linux11.0--
Appnetappontap_select_deploy_administration_utility---
Apppythonpython---
Apppythonpython3.10.0--
OSredhatenterprise_linux8.0--
Appredhatsoftware_collections---

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