CVE-2021-44224
Fixed in a distro release EPSS 82%
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
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:v3.12 | apache2 | 2.4.52-r0 |
| Alpine:v3.13 | apache2 | 2.4.52-r0 |
| Alpine:v3.14 | apache2 | 2.4.52-r0 |
| Alpine:v3.15 | apache2 | 2.4.52-r0 |
| Alpine:v3.16 | apache2 | 2.4.52-r0 |
| Alpine:v3.17 | apache2 | 2.4.52-r0 |
| Alpine:v3.18 | apache2 | 2.4.52-r0 |
| Alpine:v3.19 | apache2 | 2.4.52-r0 |
| Alpine:v3.20 | apache2 | 2.4.52-r0 |
| Alpine:v3.21 | apache2 | 2.4.52-r0 |
| Alpine:v3.22 | apache2 | 2.4.52-r0 |
| Alpine:v3.23 | apache2 | 2.4.52-r0 |
| Alpine:v3.24 | apache2 | 2.4.52-r0 |
| Debian:10 | apache2 | 2.4.38-3+deb10u7 |
| Debian:11 | apache2 | 2.4.52-1~deb11u2 |
| Debian:12 | apache2 | 2.4.52-1 |
| Debian:13 | apache2 | 2.4.52-1 |
| Debian:14 | apache2 | 2.4.52-1 |
| Debian:9 | apache2 | 2.4.25-3+deb9u12 |
| 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.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-devel | 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-manual | 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-selinux | 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-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.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-debuginfo | 1:2.4.51-28.el8jbcs |
| 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 | 0:2.4.51-28.el7jbcs |
| 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.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-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+el8.4.0+553+7a69454b |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e |
| SUSE:Enterprise Storage 6 | apache2 | 2.4.33-3.61.1 |
| SUSE:HPE Helion OpenStack 8 | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise High Performance Computing 15-ESPOS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise High Performance Computing 15-LTSS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP2 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP3 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP2 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP3 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Module for Server Applications 15 SP2 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Module for Server Applications 15 SP3 | apache2 | 2.4.51-3.37.1 |
| SUSE:Linux Enterprise Server 12 SP2-BCL | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server 12 SP3-BCL | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server 12 SP3-LTSS | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server 12 SP4-LTSS | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server 12 SP5 | apache2 | 2.4.51-35.7.1 |
| SUSE:Linux Enterprise Server 15 SP1-BCL | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Server 15 SP1-LTSS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise Server 15 SP5-LTSS | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise Server 15-LTSS | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | apache2 | 2.4.23-29.83.1 |
| SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | apache2 | 2.4.51-35.7.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | apache2 | 2.4.33-3.61.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | apache2 | 2.4.66-150400.6.57.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | apache2 | 2.4.51-35.7.1 |
| SUSE:OpenStack Cloud 8 | apache2 | 2.4.23-29.83.1 |
| SUSE:OpenStack Cloud 9 | apache2 | 2.4.23-29.83.1 |
| SUSE:OpenStack Cloud Crowbar 8 | apache2 | 2.4.23-29.83.1 |
| SUSE:OpenStack Cloud Crowbar 9 | apache2 | 2.4.23-29.83.1 |
| SUSE:Package Hub 15 SP3 | chromium | 99.0.4844.84-bp153.2.75.1 |
| Ubuntu:18.04:LTS | apache2 | 2.4.29-1ubuntu4.21 |
| Ubuntu:20.04:LTS | apache2 | 2.4.41-4ubuntu3.9 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu1 |
| Ubuntu:Pro:14.04:LTS | apache2 | 2.4.7-1ubuntu4.22+esm3 |
| Ubuntu:Pro:16.04:LTS | apache2 | 2.4.18-2ubuntu3.17+esm4 |
| openSUSE:Leap 15.3 | apache2 | 2.4.51-3.37.1 |
| openSUSE:Leap 15.3 | chromium | 99.0.4844.84-bp153.2.75.1 |
| openSUSE:Tumbleweed | apache2 | 2.4.52-1.1 |