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.
References (13)
Core 13
Core References
Patch mailing-list
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
Patch mailing-list
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Third Party Advisory vendor-advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202208-20
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
Exploit, Third Party Advisory
https://portswigger.net/research/http2
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210917-0004/
Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html
Third Party Advisory
https://www.tenable.com/security/tns-2021-17
Scores
CVSS v3
7.5
EPSS
0.0061
EPSS Percentile
70.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Details
Status
published
Products (7)
apache/http_server
2.4.17 - 2.4.49
debian/debian_linux
10.0
fedoraproject/fedora
34
fedoraproject/fedora
35
oracle/secure_backup
< 18.1.0.1.0
oracle/zfs_storage_appliance_kit
8.8
tenable/tenable.sc
< 5.19.1
Published
Aug 16, 2021
Tracked Since
Feb 18, 2026