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CVE-2021-3733

CVE-2021-3733

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

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

CVSS 6.5 · Medium · EPSS 4.8% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • python

    Versions
    • Fixed in python v3.6.14, python v3.7.11, python v3.8.10, python v3.9.5.: 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

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.4.3-1ubuntu1~14.04.7+esm11

    Update to 3.4.3-1ubuntu1~14.04.7+esm11

  • 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

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.5.2-2ubuntu0~16.04.13+esm1

    Update to 3.5.2-2ubuntu0~16.04.13+esm1

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.6.9-1~18.04ubuntu1.6

    Update to 3.6.9-1~18.04ubuntu1.6

  • python3.7 Ubuntu: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
    Affected ranges
    • ECOSYSTEM: < 3.7.5-2ubuntu1~18.04.2

    Update to 3.7.5-2ubuntu1~18.04.2

  • python3.8 Ubuntu:18.04:LTS

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

    Update to 3.8.0-3ubuntu1~18.04.2

  • python3.8 Ubuntu:20.04:LTS

    Versions
    • 3.8.0-1
    • 3.8.0-2
    • 3.8.0-3
    • 3.8.0-4
    • 3.8.0-5
    • 3.8.1-2ubuntu3
    • 3.8.2~rc1-1ubuntu1
    • 3.8.2-1
    • 3.8.2-1ubuntu1
    • 3.8.2-1ubuntu1.1
    • 3.8.2-1ubuntu1.2
    • 3.8.5-1~20.04
    • 3.8.5-1~20.04.2
    • 3.8.5-1~20.04.3
    Affected ranges
    • ECOSYSTEM: < 3.8.10-0ubuntu1~20.04

    Update to 3.8.10-0ubuntu1~20.04

  • python3.9 Ubuntu:20.04:LTS

    Versions
    • 3.9.0~rc1-1~20.04
    • 3.9.0-5~20.04
    Affected ranges
    • ECOSYSTEM: < 3.9.5-3~20.04.1

    Update to 3.9.5-3~20.04.1

Original sources

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