CVE-2022-37436
apache2: Prior to Apache HTTP Server 2.4.55, a malicious backend can cause theresponse headers to be truncated early, resultin...
CVE-2022-37436 is fixed in 30 products on 1 platform, first by apache2 2.4.29-1ubuntu4.26, released January 17, 2023. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.5272
98th percentile
Prior to Apache HTTP Server 2.4.55, a malicious backend can cause theresponse headers to be truncated early, resulting in some headers beingincorporated into the response body. If the later headers have any securitypurpose, they will not be interpreted by the client.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| apache2 · Debian 12.15 (bookworm) | 2.4.55-1 | DEBIAN-CVE-2022-37436 | Jan 17, 2023 |
| apache2 · Debian 13.5 (trixie) | 2.4.55-1 | DEBIAN-CVE-2022-37436 | Jan 17, 2023 |
| apache2 · Debian 14 | 2.4.55-1 | DEBIAN-CVE-2022-37436 | Jan 17, 2023 |
| apache2 · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2 · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2 · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2 · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2 · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-bin · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-bin 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-bin · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-bin 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-bin · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-bin 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-bin · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-bin 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-bin · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-bin 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-data · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-data 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-data · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-data 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-data · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-data 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-data · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-data 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-data · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-data 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-custom · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-suexec-custom 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-suexec-custom 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-suexec-custom 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-suexec-custom 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-custom · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-suexec-custom 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-pristine · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-suexec-pristine 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-suexec-pristine 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-suexec-pristine 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-suexec-pristine 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-pristine · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-suexec-pristine 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-utils · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-utils 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-utils · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-utils 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-utils · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-utils 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-utils · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-utils 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-utils · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-utils 2.4.55-1ubuntu1 | Jan 16, 2026 |
| httpd · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd · rocky 8 | 0:2.4.37-51.module+el8.7.0+1059+126e9251 | RLSA-2023:0852 | Feb 22, 2023 |
| httpd · rocky 9 | 0:2.4.53-7.el9_1.1 | RLSA-2023:0970 | Apr 6, 2023 |
| httpd-core · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-core · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-core · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-core · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-core-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-debugsource · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-devel · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-devel · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-devel · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-devel · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-devel · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-devel · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-devel · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-filesystem · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-filesystem · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-filesystem · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-filesystem · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-filesystem · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-filesystem · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-filesystem · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-manual · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-manual · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-manual · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-manual · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-manual · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-manual · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-manual · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-tools · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-tools · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-tools · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-tools · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-tools · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-tools · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-tools · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-tools-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| libapache2-mod-md · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | libapache2-mod-md 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| libapache2-mod-md · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | libapache2-mod-md 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| libapache2-mod-md · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | libapache2-mod-md 2.4.55-1ubuntu1 | Jan 16, 2026 |
| libapache2-mod-proxy-uwsgi · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | libapache2-mod-proxy-uwsgi 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| libapache2-mod-proxy-uwsgi · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | libapache2-mod-proxy-uwsgi 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| libapache2-mod-proxy-uwsgi · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | libapache2-mod-proxy-uwsgi 2.4.55-1ubuntu1 | Jan 16, 2026 |
| mod_http2 · RHEL 8 | 0:1.15.7-5.module+el8.6.0+13996+01710940 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_http2 · almalinux 8 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 | Feb 21, 2023 |
| mod_http2 · ol 8 | 0:1.15.7-5.module+el8.6.0+20548+01710940 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_http2 · rocky 8 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2023:0852 | Feb 22, 2023 |
| mod_ldap · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_ldap · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_ldap · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_ldap · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_ldap · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ldap · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_ldap · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_ldap-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_lua · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_lua · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_lua · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_lua · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_lua-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_md · RHEL 8 | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_md · almalinux 8 | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 | Feb 21, 2023 |
| mod_md · ol 8 | 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_md · rocky 8 | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2023:0852 | Feb 22, 2023 |
| mod_proxy_html · RHEL 8 | 1:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_proxy_html · RHEL 9 | 1:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_proxy_html · almalinux 8 | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_proxy_html · almalinux 9 | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_proxy_html · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_proxy_html · ol 8 | 1:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_proxy_html · ol 9 | 1:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_proxy_html-debuginfo · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_session · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_session · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_session · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_session · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_session · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_session · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_session · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_session-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ssl · RHEL 8 | 1:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_ssl · RHEL 9 | 1:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_ssl · almalinux 8 | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_ssl · almalinux 9 | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_ssl · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ssl · ol 8 | 1:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_ssl · ol 9 | 1:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_ssl-debuginfo · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
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