HTTP/2 Request Splitting and Cache Poisoning Vulnerability in Apache HTTP Server 2.4.17 to 2.4.48

CVE-2021-33193 · HIGH Severity

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

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