Unrated severityNVD Advisory· Published Dec 20, 2021· Updated Aug 4, 2024
Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier
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
48>=2.4.7 <=2.4.51+ 1 more
- (no CPE)range: >=2.4.7 <=2.4.51
- (no CPE)range: 2.4.7
- 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- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/mitrevendor-advisoryx_refsource_FEDORA
- security.gentoo.org/glsa/202208-20mitrevendor-advisoryx_refsource_GENTOO
- www.debian.org/security/2022/dsa-5035mitrevendor-advisoryx_refsource_DEBIAN
- httpd.apache.org/security/vulnerabilities_24.htmlmitrex_refsource_MISC
- seclists.org/fulldisclosure/2022/May/33mitremailing-listx_refsource_FULLDISC
- seclists.org/fulldisclosure/2022/May/35mitremailing-listx_refsource_FULLDISC
- seclists.org/fulldisclosure/2022/May/38mitremailing-listx_refsource_FULLDISC
- www.openwall.com/lists/oss-security/2021/12/20/3mitremailing-listx_refsource_MLIST
- security.netapp.com/advisory/ntap-20211224-0001/mitrex_refsource_CONFIRM
- support.apple.com/kb/HT213255mitrex_refsource_CONFIRM
- support.apple.com/kb/HT213256mitrex_refsource_CONFIRM
- support.apple.com/kb/HT213257mitrex_refsource_CONFIRM
- www.oracle.com/security-alerts/cpuapr2022.htmlmitrex_refsource_MISC
- www.oracle.com/security-alerts/cpujan2022.htmlmitrex_refsource_MISC
- www.tenable.com/security/tns-2022-01mitrex_refsource_CONFIRM
- www.tenable.com/security/tns-2022-03mitrex_refsource_CONFIRM
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