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CVE-2021-33193

Date: August 16, 2021

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.

Severity Score

Related Resources (19)

https://nvd.nist.gov/vuln/detail/CVE-2021-33193
https://portswigger.net/research/http2
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d@%3Ccvs.httpd.apache.org%3E
https://access.redhat.com/security/cve/CVE-2021-33193
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70@%3Ccvs.httpd.apache.org%3E
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33193
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
https://www.tenable.com/security/tns-2021-17
https://security.netapp.com/advisory/ntap-20210917-0004/
https://security.alpinelinux.org/vuln/CVE-2021-33193
https://www.oracle.com/security-alerts/cpujan2022.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
https://security-tracker.debian.org/tracker/CVE-2021-33193
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.gentoo.org/glsa/202208-20
https://www.mend.io/vulnerability-database/CVE-2021-33193

Severity Score

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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