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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.7 – < Apache HTTP Server 2.4* | Apache HTTP Server 2.4* |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.52-1 | — |
| Debian 13 | apache2 | 2.4.52-1 | — |
| Debian 12 | apache2 | 2.4.52-1 | — |
| Debian 11 | apache2 | 2.4.52-1~deb11u2 | DSA-5035-1 |
| Debian 10 | apache2 | 2.4.38-3+deb10u7 | DSA-5035-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | apache2 | 2.4.25-3+deb9u12 | DLA-2907-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu1 | — |
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.9 | USN-5212-1 |
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.21 | USN-5212-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm4 | USN-5212-2 |
| Ubuntu Pro 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22+esm3 | USN-5212-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +6 | 2.4.37-47.module+el8.6.0+14529+083145da.1 | RHSA-2022:1915 |
| RHEL 8 | mod_http2 | 1.15.7-5.module+el8.6.0+13996+01710940 | RHSA-2022:1915 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2022:1915 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+14529+083145da.1 | RHSA-2022:1915 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-23.el7.5 | RHSA-2022:6753 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-23.el7.5 | RHSA-2022:6753 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.51-28.el7jbcs | RHSA-2022:7143 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.51-28.el7jbcs | RHSA-2022:7143 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | httpd +6 | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux 8 | mod_http2 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa | ALSA-2022:1915 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2022:1915 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | httpd | 2.4.37-47.module+el8.6.0+823+f143cee1.1 | RLSA-2022:1915 |
| Rocky Linux 8 | mod_http2 | 1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2022:1915 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2022:1915 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 15 SP3 | apache2 | 2.4.51-3.37.1 | SUSE-SU-2022:0091-1 |
| SLES 15 SP2 | apache2 | 2.4.51-3.37.1 | SUSE-SU-2022:0091-2, SUSE-SU-2022:0091-1 |
| SLES 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES 12 SP5 | apache2 | 2.4.51-35.7.1 | SUSE-SU-2022:0440-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES for SAP 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES for SAP 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES for SAP 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES for SAP 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLES for SAP 12 SP5 | apache2 | 2.4.51-35.7.1 | SUSE-SU-2022:0440-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SLE HPC 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLE HPC 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLE HPC 15 SP1 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SLE HPC 15 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
| SUSE Package Hub 15 SP3 | chromium | 99.0.4844.84-bp153.2.75.1 | openSUSE-SU-2022:0091-1 |
| SUSE OpenStack Cloud Crowbar 9 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud Crowbar 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud 9 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE OpenStack Cloud 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE HPE Helion OpenStack 8 | apache2 | 2.4.23-29.83.1 | SUSE-SU-2022:0065-1 |
| SUSE Enterprise Storage 6 | apache2 | 2.4.33-3.61.1 | SUSE-SU-2022:0119-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.52-1.1 | openSUSE-SU-2024:11695-1 |
| openSUSE Leap 15.3 | apache2 | 2.4.51-3.37.1 | openSUSE-SU-2022:0091-1 |
| openSUSE Leap 15.3 | chromium | 99.0.4844.84-bp153.2.75.1 | openSUSE-SU-2022:0091-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.52-r0 | — |
| Alpine v3.23 | apache2 | 2.4.52-r0 | — |
| Alpine v3.22 | apache2 | 2.4.52-r0 | — |
| Alpine v3.21 | apache2 | 2.4.52-r0 | — |
| Alpine v3.20 | apache2 | 2.4.52-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.52-r0 | — |
| Alpine v3.18 | apache2 | 2.4.52-r0 | — |
| Alpine v3.17 | apache2 | 2.4.52-r0 | — |
| Alpine v3.16 | apache2 | 2.4.52-r0 | — |
| Alpine v3.15 | apache2 | 2.4.52-r0 | — |
| Alpine v3.14 | apache2 | 2.4.52-r0 | — |
| Alpine v3.13 | apache2 | 2.4.52-r0 | — |
| Alpine v3.12 | apache2 | 2.4.52-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.54-3.amzn2023.0.4 | ALAS2023-2023-072 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.54-3.amzn2023.0.4 | ALAS2023-2023-072 |
| Amazon Linux 2 | httpd +7 | 2.4.52-1.amzn2 | ALAS2-2022-1737 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.52-1.amzn2 | ALAS2-2022-1737 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.52-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +6 | 2.4.37-47.0.1.module+el8.6.0+20649+083145da.1 | ELSA-2022-1915 |
| Oracle Linux 8 | mod_http2 | 1.15.7-5.module+el8.6.0+20548+01710940 | ELSA-2022-1915 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5 | ELSA-2022-1915 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-47.0.1.module+el8.6.0+20649+083145da.1 | ELSA-2022-1915 |
Advisories 26
- ALSA-2022:1915 Moderate: httpd:2.4 security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2022:7143 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:6753 Red Hat Security Advisory: httpd24-httpd security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2022:1915 Red Hat Security Advisory: httpd:2.4 security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- WID-SEC-2022-0727 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-5212-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5212-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5035-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2907-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:1915 Moderate: httpd:2.4 security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2022:0440-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0065-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0091-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0091-2 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11695-1 apache2-2.4.52-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0119-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0091-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- WID-SEC-2024-2180 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 18, 2024
- WID-SEC-2022-1057 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 21, 2023
- ALAS2023-2023-072 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2022-1915 Moderate: httpd:2.4 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 17, 2022
- ALAS2-2022-1737 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 20, 2022
References
- http://httpd.apache.org/security/vulnerabilities_24.html
- [oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier mailing-list
- FEDORA-2021-29a536c2ae vendor-advisory
- DSA-5035 vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://security.netapp.com/advisory/ntap-20211224-0001/
- https://www.tenable.com/security/tns-2022-01
- https://www.tenable.com/security/tns-2022-03
- FEDORA-2022-b4103753e9 vendor-advisory
- FEDORA-2022-21264ec6db vendor-advisory
- FEDORA-2022-78e3211c55 vendor-advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://support.apple.com/kb/HT213257
- https://support.apple.com/kb/HT213256
- https://support.apple.com/kb/HT213255
- 20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina mailing-list
- 20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6 mailing-list
- 20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4 mailing-list
- GLSA-202208-20 vendor-advisory