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CVE-2021-4189

CVE-2021-4189

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 5.3 · Medium · EPSS 3.4% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • python

    Versions
    • Fixed in python 3.6.14, python 3.7.11, python 3.8.9, python 3.9.3, python 3.10.0: Affected

    No fix published

  • pypy3 Debian:12

    Affected ranges
    • ECOSYSTEM: < 7.3.5+dfsg-2

    Update to 7.3.5+dfsg-2

  • pypy3 Debian:13

    Affected ranges
    • ECOSYSTEM: < 7.3.5+dfsg-2

    Update to 7.3.5+dfsg-2

  • pypy3 Debian:14

    Affected ranges
    • ECOSYSTEM: < 7.3.5+dfsg-2

    Update to 7.3.5+dfsg-2

  • python2.7 Ubuntu:Pro:14.04:LTS

    Versions
    • 2.7.5-8ubuntu3
    • 2.7.5-8ubuntu4
    • 2.7.6-2
    • 2.7.6-2ubuntu1
    • 2.7.6-3
    • 2.7.6-3ubuntu1
    • 2.7.6-4
    • 2.7.6-4ubuntu1
    • 2.7.6-5
    • 2.7.6-7
    • 2.7.6-8
    • 2.7.6-8ubuntu0.2
    • 2.7.6-8ubuntu0.3
    • 2.7.6-8ubuntu0.4
    • 2.7.6-8ubuntu0.5
    • 2.7.6-8ubuntu0.6+esm2
    • 2.7.6-8ubuntu0.6+esm3
    • 2.7.6-8ubuntu0.6+esm5
    • 2.7.6-8ubuntu0.6+esm6
    • 2.7.6-8ubuntu0.6+esm7
    • 2.7.6-8ubuntu0.6+esm8
    • 2.7.6-8ubuntu0.6+esm9
    • 2.7.6-8ubuntu0.6+esm10
    • 2.7.6-8ubuntu0.6+esm11
    Affected ranges
    • ECOSYSTEM: < 2.7.6-8ubuntu0.6+esm12

    Update to 2.7.6-8ubuntu0.6+esm12

  • python3.4 Ubuntu:Pro:14.04:LTS

    Versions
    • 3.4~b1-0ubuntu3
    • 3.4~b1-4ubuntu4
    • 3.4~b1-4ubuntu6
    • 3.4~b1-5ubuntu2
    • 3.4~b2-1
    • 3.4~b3-1ubuntu1
    • 3.4~rc1-1build1
    • 3.4~rc2-1
    • 3.4~rc3-0ubuntu1
    • 3.4.0-1
    • 3.4.0-2ubuntu1
    • 3.4.0-2ubuntu1.1
    • 3.4.3-1ubuntu1~14.04.1
    • 3.4.3-1ubuntu1~14.04.3
    • 3.4.3-1ubuntu1~14.04.4
    • 3.4.3-1ubuntu1~14.04.5
    • 3.4.3-1ubuntu1~14.04.6
    • 3.4.3-1ubuntu1~14.04.7
    • 3.4.3-1ubuntu1~14.04.7+esm2
    • 3.4.3-1ubuntu1~14.04.7+esm4
    • 3.4.3-1ubuntu1~14.04.7+esm6
    • 3.4.3-1ubuntu1~14.04.7+esm7
    • 3.4.3-1ubuntu1~14.04.7+esm8
    • 3.4.3-1ubuntu1~14.04.7+esm10
    • 3.4.3-1ubuntu1~14.04.7+esm11
    Affected ranges
    • ECOSYSTEM: < 3.4.3-1ubuntu1~14.04.7+esm12

    Update to 3.4.3-1ubuntu1~14.04.7+esm12

  • python3.5 Ubuntu:Pro:14.04:LTS

    Versions
    • 3.5.2-2ubuntu0~16.04.4~14.04.1
    Affected ranges
    • ECOSYSTEM: < 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1

    Update to 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1

  • python2.7 Ubuntu:Pro:16.04:LTS

    Versions
    • 2.7.10-4ubuntu1
    • 2.7.10-4ubuntu2
    • 2.7.11-2
    • 2.7.11-3
    • 2.7.11-4
    • 2.7.11-6
    • 2.7.11-7
    • 2.7.11-7ubuntu1
    • 2.7.12-1~16.04
    • 2.7.12-1ubuntu0~16.04.1
    • 2.7.12-1ubuntu0~16.04.2
    • 2.7.12-1ubuntu0~16.04.3
    • 2.7.12-1ubuntu0~16.04.4
    • 2.7.12-1ubuntu0~16.04.8
    • 2.7.12-1ubuntu0~16.04.9
    • 2.7.12-1ubuntu0~16.04.11
    • 2.7.12-1ubuntu0~16.04.12
    • 2.7.12-1ubuntu0~16.04.13
    • 2.7.12-1ubuntu0~16.04.14
    • 2.7.12-1ubuntu0~16.04.16
    • 2.7.12-1ubuntu0~16.04.18
    Affected ranges
    • ECOSYSTEM: < 2.7.12-1ubuntu0~16.04.18+esm1

    Update to 2.7.12-1ubuntu0~16.04.18+esm1

  • python3.5 Ubuntu:Pro:16.04:LTS

    Versions
    • 3.5.0-3
    • 3.5.0-3ubuntu1
    • 3.5.1~rc1-2ubuntu1
    • 3.5.1-1
    • 3.5.1-2
    • 3.5.1-3
    • 3.5.1-5
    • 3.5.1-6ubuntu1
    • 3.5.1-6ubuntu2
    • 3.5.1-9ubuntu1
    • 3.5.1-10
    • 3.5.2-2~16.01
    • 3.5.2-2~16.04
    • 3.5.2-2ubuntu0~16.04.1
    • 3.5.2-2ubuntu0~16.04.2
    • 3.5.2-2ubuntu0~16.04.3
    • 3.5.2-2ubuntu0~16.04.4
    • 3.5.2-2ubuntu0~16.04.5
    • 3.5.2-2ubuntu0~16.04.8
    • 3.5.2-2ubuntu0~16.04.9
    • 3.5.2-2ubuntu0~16.04.10
    • 3.5.2-2ubuntu0~16.04.11
    • 3.5.2-2ubuntu0~16.04.12
    • 3.5.2-2ubuntu0~16.04.13
    • 3.5.2-2ubuntu0~16.04.13+esm1
    Affected ranges
    • ECOSYSTEM: < 3.5.2-2ubuntu0~16.04.13+esm2

    Update to 3.5.2-2ubuntu0~16.04.13+esm2

  • python2.7 Ubuntu:18.04:LTS

    Versions
    • 2.7.14-2ubuntu2
    • 2.7.14-4
    • 2.7.14-6
    • 2.7.14-7
    • 2.7.14-8
    • 2.7.15~rc1-1
    • 2.7.15~rc1-1ubuntu0.1
    • 2.7.15-4ubuntu4~18.04
    • 2.7.15-4ubuntu4~18.04.1
    • 2.7.15-4ubuntu4~18.04.2
    • 2.7.17-1~18.04
    • 2.7.17-1~18.04ubuntu1
    • 2.7.17-1~18.04ubuntu1.1
    • 2.7.17-1~18.04ubuntu1.2
    • 2.7.17-1~18.04ubuntu1.3
    • 2.7.17-1~18.04ubuntu1.5
    • 2.7.17-1~18.04ubuntu1.6
    Affected ranges
    • ECOSYSTEM: < 2.7.17-1~18.04ubuntu1.7

    Update to 2.7.17-1~18.04ubuntu1.7

  • python3.6 Ubuntu:18.04:LTS

    Versions
    • 3.6.3-1ubuntu1
    • 3.6.4~rc1-1
    • 3.6.4~rc1-2
    • 3.6.4-1
    • 3.6.4-2
    • 3.6.4-3build1
    • 3.6.4-4
    • 3.6.5~rc1-1
    • 3.6.5-3
    • 3.6.6-1~18.04
    • 3.6.7-1~18.04
    • 3.6.8-1~18.04.1
    • 3.6.8-1~18.04.2
    • 3.6.8-1~18.04.3
    • 3.6.9-1~18.04
    • 3.6.9-1~18.04ubuntu1
    • 3.6.9-1~18.04ubuntu1.1
    • 3.6.9-1~18.04ubuntu1.3
    • 3.6.9-1~18.04ubuntu1.4
    • 3.6.9-1~18.04ubuntu1.6
    Affected ranges
    • ECOSYSTEM: < 3.6.9-1~18.04ubuntu1.7

    Update to 3.6.9-1~18.04ubuntu1.7

  • python3.7 Ubuntu:Pro:18.04:LTS

    Versions
    • 3.7.0~a2-1
    • 3.7.0~a3-1
    • 3.7.0~a3-2
    • 3.7.0~a3-3
    • 3.7.0~a4-1
    • 3.7.0~b1-1
    • 3.7.0~b1-1build1
    • 3.7.0~b2-1
    • 3.7.0~b3-1
    • 3.7.0-1~18.04
    • 3.7.1-1~18.04
    • 3.7.3-2~18.04.1
    • 3.7.5-2~18.04
    • 3.7.5-2~18.04.4
    • 3.7.5-2ubuntu1~18.04.2
    • 3.7.5-2ubuntu1~18.04.2+esm1
    • 3.7.5-2ubuntu1~18.04.2+esm2
    Affected ranges
    • ECOSYSTEM: < 3.7.5-2ubuntu1~18.04.2+esm3

    Update to 3.7.5-2ubuntu1~18.04.2+esm3

  • python3.8 Ubuntu:Pro:18.04:LTS

    Versions
    • 3.8.0-3~18.04
    • 3.8.0-3~18.04.1
    • 3.8.0-3ubuntu1~18.04.2
    • 3.8.0-3ubuntu1~18.04.2+esm1
    Affected ranges
    • ECOSYSTEM: < 3.8.0-3ubuntu1~18.04.2+esm2

    Update to 3.8.0-3ubuntu1~18.04.2+esm2

  • python2.7 Ubuntu:Pro:20.04:LTS

    Versions
    • 2.7.17~rc1-1
    • 2.7.17-1
    • 2.7.17-1ubuntu5
    • 2.7.17-1ubuntu6
    • 2.7.18~rc1-2
    • 2.7.18-1~20.04
    • 2.7.18-1~20.04.1
    • 2.7.18-1~20.04.1+esm1
    • 2.7.18-1~20.04.3
    Affected ranges
    • ECOSYSTEM: < 2.7.18-1~20.04.3+esm1

    Update to 2.7.18-1~20.04.3+esm1

  • python2.7 Ubuntu:Pro:22.04:LTS

    Versions
    • 2.7.18-8build1
    • 2.7.18-13
    • 2.7.18-13ubuntu1
    • 2.7.18-13ubuntu1.1
    Affected ranges
    • ECOSYSTEM: < 2.7.18-13ubuntu1.1+esm2

    Update to 2.7.18-13ubuntu1.1+esm2

Original sources

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