CVE-2021-33193

httpd: Request splitting via HTTP/2 method injection and mod_proxy

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Severity

Moderate

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · August 5, 2021

Updated · October 9, 2026

Description

A NULL pointer dereference was found in Apache httpd mod_h2. The highest threat from this flaw is to system integrity.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

This flaw can be mitigated by disabling HTTP/2. More information available at: https://httpd.apache.org/docs/2.4/mod/mod_http2.html

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE-476 · NULL Pointer Dereference