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CVE-2021-33193

CVE-2021-33193 · Request splitting via HTTP/2 method injection and mod_proxy

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

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

CVSS 7.5 · High · EPSS 46.2% · Fix available

Published
Updated

Stack: system · web

Affected products and versions

  • apache httpd

    Versions
    • Apache HTTP Server 2.4 2.4.17 to 2.4.48: Affected

    No fix published

  • apache2 Debian:12

    Affected ranges
    • ECOSYSTEM: < 2.4.48-4

    Update to 2.4.48-4

  • apache2 Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.4.48-4

    Update to 2.4.48-4

  • apache2 Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.4.48-4

    Update to 2.4.48-4

  • apache2 Ubuntu:18.04:LTS

    Versions
    • 2.4.27-2ubuntu3
    • 2.4.29-1ubuntu1
    • 2.4.29-1ubuntu2
    • 2.4.29-1ubuntu3
    • 2.4.29-1ubuntu4
    • 2.4.29-1ubuntu4.1
    • 2.4.29-1ubuntu4.2
    • 2.4.29-1ubuntu4.3
    • 2.4.29-1ubuntu4.4
    • 2.4.29-1ubuntu4.5
    • 2.4.29-1ubuntu4.6
    • 2.4.29-1ubuntu4.7
    • 2.4.29-1ubuntu4.8
    • 2.4.29-1ubuntu4.10
    • 2.4.29-1ubuntu4.11
    • 2.4.29-1ubuntu4.12
    • 2.4.29-1ubuntu4.13
    • 2.4.29-1ubuntu4.14
    • 2.4.29-1ubuntu4.16
    Affected ranges
    • ECOSYSTEM: < 2.4.29-1ubuntu4.17

    Update to 2.4.29-1ubuntu4.17

  • apache2 Ubuntu:20.04:LTS

    Versions
    • 2.4.41-1ubuntu1
    • 2.4.41-4ubuntu1
    • 2.4.41-4ubuntu2
    • 2.4.41-4ubuntu3
    • 2.4.41-4ubuntu3.1
    • 2.4.41-4ubuntu3.3
    • 2.4.41-4ubuntu3.4
    Affected ranges
    • ECOSYSTEM: < 2.4.41-4ubuntu3.5

    Update to 2.4.41-4ubuntu3.5

Original sources

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