High severity8.2NVD Advisory· Published Dec 20, 2021· Updated Jun 17, 2026
CVE-2021-44224
CVE-2021-44224
Description
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
82cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*range: >=2.4.7,<2.4.52
- (no CPE)range: 2.4.7 - 2.4.51
- (no CPE)range: 2.4.7
- cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:*Range: <9.0
cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_operations_monitor:5.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:*Range: <9.0
- cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:*Range: <9.0
cpe:2.3:a:oracle:http_server:-:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:oracle:http_server:-:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.15.7:*:*:*:*:*:*:*+ 12 more
- cpe:2.3:o:apple:mac_os_x:10.15.7:*:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:*
- cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
- osv-coords46 versionspkg:bitnami/apachepkg:rpm/almalinux/httpdpkg:rpm/almalinux/httpd-develpkg:rpm/almalinux/httpd-filesystempkg:rpm/almalinux/httpd-manualpkg:rpm/almalinux/httpd-toolspkg:rpm/almalinux/mod_http2pkg:rpm/almalinux/mod_ldappkg:rpm/almalinux/mod_mdpkg:rpm/almalinux/mod_proxy_htmlpkg:rpm/almalinux/mod_sessionpkg:rpm/almalinux/mod_sslpkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/chromium&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/apache2&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/apache2&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP2pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP3pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/apache2&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/apache2&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/apache2&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/apache2&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/chromium&distro=SUSE%20Package%20Hub%2015%20SP3
>= 2.4.7, < 2.4.52+ 45 more
- (no CPE)range: >= 2.4.7, < 2.4.52
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2935+fb177b09.2
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2935+fb177b09.2
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2935+fb177b09.2
- (no CPE)range: < 1.15.7-5.module_el8.6.0+2872+fe0ff7aa
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2935+fb177b09.2
- (no CPE)range: < 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
- (no CPE)range: < 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma
- (no CPE)range: < 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma
- (no CPE)range: < 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.52-1.1
- (no CPE)range: < 99.0.4844.84-bp153.2.75.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.51-3.37.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.51-35.7.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.51-35.7.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.33-3.61.1
- (no CPE)range: < 2.4.51-35.7.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 2.4.23-29.83.1
- (no CPE)range: < 99.0.4844.84-bp153.2.75.1
Patches
Vulnerability mechanics
References
19- www.oracle.com/security-alerts/cpuapr2022.htmlnvdPatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.htmlnvdPatchThird Party Advisory
- httpd.apache.org/security/vulnerabilities_24.htmlnvdVendor Advisory
- seclists.org/fulldisclosure/2022/May/33nvdMailing ListThird Party Advisory
- seclists.org/fulldisclosure/2022/May/35nvdMailing ListThird Party Advisory
- seclists.org/fulldisclosure/2022/May/38nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/12/20/3nvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202208-20nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20211224-0001/nvdThird Party Advisory
- support.apple.com/kb/HT213255nvdThird Party Advisory
- support.apple.com/kb/HT213256nvdThird Party Advisory
- support.apple.com/kb/HT213257nvdThird Party Advisory
- www.debian.org/security/2022/dsa-5035nvdThird Party Advisory
- www.tenable.com/security/tns-2022-01nvdThird Party Advisory
- www.tenable.com/security/tns-2022-03nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/nvd
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