Vulnerability · Published Jan 17, 2023 · Assigned by apache
CVE-2022-37436Apache HTTP Server: mod_proxy prior to 2.4.55 allows a backend to trigger HTTP response splitting
Medium 5.3
In plain English
A medium-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 52.7% (higher than 99% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)52.7%top 1.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | httpd | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | httpd | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:9 | httpd-core | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | httpd-devel | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | httpd-devel | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | httpd-filesystem | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | httpd-manual | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | httpd-manual | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | httpd-tools | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | httpd-tools | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | mod_http2 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 |
| AlmaLinux:8 | mod_http2 | 1.15.7-5.module_el8.6.0+3031+fb177b09 | ALSA-2023:0852 |
| AlmaLinux:8 | mod_ldap | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | mod_ldap | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:9 | mod_lua | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+3031+fb177b09 | ALSA-2023:0852 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | mod_proxy_html | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | mod_session | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | mod_session | 2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 |
| AlmaLinux:9 | mod_ssl | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 |
| Alpine:v3.20 | apache2 | 2.4.55-r0 | ALPINE-CVE-2022-37436 |
| Alpine:v3.21 | apache2 | 2.4.55-r0 | ALPINE-CVE-2022-37436 |
| Alpine:v3.22 | apache2 | 2.4.55-r0 | ALPINE-CVE-2022-37436 |
| Alpine:v3.23 | apache2 | 2.4.55-r0 | ALPINE-CVE-2022-37436 |
| Alpine:v3.24 | apache2 | 2.4.55-r0 | ALPINE-CVE-2022-37436 |
| Debian:12 | apache2 | 2.4.55-1 | DEBIAN-CVE-2022-37436 |
| Debian:13 | apache2 | 2.4.55-1 | DEBIAN-CVE-2022-37436 |
| Debian:14 | apache2 | 2.4.55-1 | DEBIAN-CVE-2022-37436 |
| Rocky Linux:8 | httpd | 0:2.4.37-51.module+el8.7.0+1059+126e9251 | RLSA-2023:0852 |
| Rocky Linux:9 | httpd | 0:2.4.53-7.el9_1.1 | RLSA-2023:0970 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2023:0852 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2023:0852 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.3 | USN-5839-1 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.3 | UBUNTU-CVE-2022-37436 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 0 – before 2.4.55 |
Weakness: CWE-113 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N