CVE-2021-33193
Fixed in a distro release EPSS 46%
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.
Products: Apache Software Foundation Apache HTTP Server
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 8 | httpd | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | httpd | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | httpd-devel | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | httpd-devel | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | httpd-filesystem | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | httpd-filesystem | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | httpd-manual | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | httpd-manual | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | httpd-tools | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | httpd-tools | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | mod_http2 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa |
| AlmaLinux 8 | mod_ldap | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | mod_ldap | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa |
| AlmaLinux 8 | mod_proxy_html | 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | mod_proxy_html | 1:2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | mod_session | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | mod_session | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| AlmaLinux 8 | mod_ssl | 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma |
| AlmaLinux 8 | mod_ssl | 1:2.4.37-47.module_el8.6.0+2935+fb177b09.2 |
| Alpine 3.11 | apache2 | 2.4.49-r0 |
| Alpine 3.12 | apache2 | 2.4.49-r0 |
| Alpine 3.13 | apache2 | 2.4.49-r0 |
| Alpine 3.14 | apache2 | 2.4.49-r0 |
| Alpine 3.15 | apache2 | 2.4.49-r0 |
| Alpine 3.16 | apache2 | 2.4.49-r0 |
| Alpine 3.17 | apache2 | 2.4.49-r0 |
| Alpine 3.18 | apache2 | 2.4.49-r0 |
| Alpine 3.19 | apache2 | 2.4.49-r0 |
| Alpine 3.20 | apache2 | 2.4.49-r0 |
| Alpine 3.21 | apache2 | 2.4.49-r0 |
| Alpine 3.22 | apache2 | 2.4.49-r0 |
| Alpine 3.23 | apache2 | 2.4.49-r0 |
| Alpine 3.24 | apache2 | 2.4.49-r0 |
| Debian 10 | apache2 | 2.4.38-3+deb10u9 |
| Debian 12 | apache2 | 2.4.48-4 |
| Debian 13 | apache2 | 2.4.48-4 |
| Debian 14 | apache2 | 2.4.48-4 |
| Red Hat Enterprise Linux 8 | httpd | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-debuginfo | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-debugsource | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-devel | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-filesystem | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-manual | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-tools | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | httpd-tools-debuginfo | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_http2 | 0:1.15.7-5.module+el8.6.0+13996+01710940 |
| Red Hat Enterprise Linux 8 | mod_http2-debuginfo | 0:1.15.7-5.module+el8.6.0+13996+01710940 |
| Red Hat Enterprise Linux 8 | mod_http2-debugsource | 0:1.15.7-5.module+el8.6.0+13996+01710940 |
| Red Hat Enterprise Linux 8 | mod_ldap | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_ldap-debuginfo | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 |
| Red Hat Enterprise Linux 8 | mod_md-debuginfo | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 |
| Red Hat Enterprise Linux 8 | mod_md-debugsource | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 |
| Red Hat Enterprise Linux 8 | mod_proxy_html | 1:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_proxy_html-debuginfo | 1:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_session | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_session-debuginfo | 0:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_ssl | 1:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat Enterprise Linux 8 | mod_ssl-debuginfo | 1:2.4.37-47.module+el8.6.0+14529+083145da.1 |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-debuginfo | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-debuginfo | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-devel | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-devel | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-manual | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-manual | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-selinux | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-selinux | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-tools | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-tools | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-httpd-tools-debuginfo | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ldap | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ldap | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ldap-debuginfo | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_proxy_html | 1:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_proxy_html | 1:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_proxy_html-debuginfo | 1:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_session | 0:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_session | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_session-debuginfo | 0:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ssl | 1:2.4.51-28.el7jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ssl | 1:2.4.51-28.el8jbcs |
| Red Hat jboss core services 1 | jbcs-httpd24-mod_ssl-debuginfo | 1:2.4.51-28.el8jbcs |
| Red Hat rhel software collections 3 | httpd24-httpd | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-httpd-debuginfo | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-httpd-devel | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-httpd-manual | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-httpd-tools | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-mod_ldap | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-mod_proxy_html | 1:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-mod_session | 0:2.4.34-23.el7.5 |
| Red Hat rhel software collections 3 | httpd24-mod_ssl | 1:2.4.34-23.el7.5 |
| Rocky Linux 8 | httpd | 0:2.4.37-47.module+el8.6.0+823+f143cee1.1 |
| Rocky Linux 8 | mod_http2 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b |
| SUSE Enterprise Storage 6 | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | apache2 | 2.4.43-3.25.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | apache2 | 2.4.43-3.25.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | apache2 | 2.4.43-3.25.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | apache2 | 2.4.43-3.25.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | apache2 | 2.4.43-3.25.1 |
| SUSE Linux Enterprise Server 12 SP5 | apache2 | 2.4.23-29.77.2 |
| SUSE Linux Enterprise Server 15 SP1-BCL | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Server 15 SP1-LTSS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Server 15-LTSS | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | apache2 | 2.4.23-29.77.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | apache2 | 2.4.33-3.55.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | apache2 | 2.4.23-29.77.2 |
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.17 |
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.5 |
| openSUSE Leap 15.2 | apache2 | 2.4.43-lp152.2.18.1 |
| openSUSE Leap 15.3 | apache2 | 2.4.43-3.25.1 |