CVE-2021-33193

PoC —

CVSS 3.1

7.5 high

EPSS

46%p99

Published

Aug 16, 2021 (Aug 16, 2021)

Modified

Jun 17, 2026

Description

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.

Vendors: debian apache fedoraproject tenable oracle
Products: debian linux, http server, fedora, tenable.sc, secure backup, zfs storage appliance kit
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (46.2%)

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