CVE-2021-33193 Information

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.

CVSS Vector

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

Reference

https://portswigger.net/research/http2 https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70@%3Ccvs.httpd.apache.org%3E https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d@%3Ccvs.httpd.apache.org%3E https://security.netapp.com/advisory/ntap-20210917-0004/ https://lists.fedoraproject.org/archives/list/[email protected]/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/ https://www.tenable.com/security/tns-2021-17 https://lists.fedoraproject.org/archives/list/[email protected]/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/ https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ https://www.oracle.com/security-alerts/cpujan2022.html https://www.oracle.com/security-alerts/cpuapr2022.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5