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Fencer Vulns
medium 5.3

CVE-2022-37436 json

Apache HTTP Server: mod_proxy prior to 2.4.55 allows a backend to trigger HTTP response splitting

published 2023-01-17 3 y ago modified 2026-09-08 2 mo ago also BIT-apache-2022-37436 , EUVD-2022-40063

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
52.7%
EPSS 52.7% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami apache 2.4.55
  • Apache Software Foundation Apache HTTP Server 2.4.55
  • apache2 Debian 14, Debian 13, Debian 12 2.4.55-1

debian advisories DEBIAN-CVE-2022-37436

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.26
  • apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.13
  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.3
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm9

ubuntu advisories UBUNTU-CVE-2022-37436

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-apr jboss core services 1 1.7.0-8.el7jbcs
  • jbcs-httpd24-apr jboss core services 1 1.7.0-8.el8jbcs
  • jbcs-httpd24-curl jboss core services 1 8.2.1-1.el7jbcs
  • jbcs-httpd24-curl jboss core services 1 8.2.1-1.el8jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el8jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el7jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el8jbcs

red hat advisories RHSA-2023:4629RHSA-2023:0970RHSA-2023:0852

  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
  • apache2 SLE Module for Server Applications 15 SP4, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP4 +1 more 2.4.51-150400.6.6.1
  • apache2 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +10 more 2.4.51-150200.3.51.1
  • apache2 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS +1 more 2.4.33-150000.3.72.1
  • apache2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.51-35.22.1
  • apache2 SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLES 12 SP2-BCL +2 more 2.4.23-29.94.1

suse advisories SUSE-SU-2026:2686-1SUSE-SU-2023:0322-1SUSE-SU-2023:0321-1SUSE-SU-2023:0294-1SUSE-SU-2023:0185-1SUSE-SU-2023:0183-1

  • apache2 openSUSE Tumbleweed 2.4.55-1.1

opensuse advisories openSUSE-SU-2024:12635-1

  • httpd AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_lua AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_ssl AlmaLinux 9 1:2.4.53-7.el9_1.1
  • mod_ldap AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-core AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-tools AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_session AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-manual AlmaLinux 9 2.4.53-7.el9_1.1

almalinux advisories ALSA-2023:0970ALSA-2023:0852

  • httpd Rocky Linux 9 2.4.53-7.el9_1.1
  • httpd Rocky Linux 8 2.4.37-51.module+el8.7.0+1059+126e9251
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_http2 Rocky Linux 8 1.15.7-5.module+el8.6.0+823+f143cee1

rocky linux advisories RLSA-2023:0970RLSA-2023:0852

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.4.55-r0

alpine advisories ALPINE-CVE-2022-37436

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd CBL-Mariner 2.0 2.4.55-1
  • mod_http2 Azure Linux 3.0 2.0.29-3

azure linux advisories AZL-13167AZL-45000

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • apache Arch Linux 2.4.55-1

arch linux advisories AVG-2824

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-37436 updated cvss 5.3

httpd: mod_proxy: HTTP response splitting

  • Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat JBoss Enterprise Application Platform 6 httpd22 httpd22
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-mod_ldap, httpd24-httpd-tools, httpd24-mod_session, +2 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-51.module+el8.7.0+18026+7b169787.1, mod_http2 1.15.7-5.module+el8.6.0+13996+01710940, mod_ssl 2.4.37-51.module+el8.7.0+18026+7b169787.1, mod_ldap 2.4.37-51.module+el8.7.0+18026+7b169787.1, httpd-tools 2.4.37-51.module+el8.7.0+18026+7b169787.1, +4 more
    fixed: vendor fix RHSA-2023:0852
  • Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.53-7.el9_1.1, mod_lua 2.4.53-7.el9_1.1, mod_ssl 2.4.53-7.el9_1.1, mod_ldap 2.4.53-7.el9_1.1, httpd-core 2.4.53-7.el9_1.1, httpd-tools 2.4.53-7.el9_1.1, +4 more
    fixed: vendor fix RHSA-2023:0970
  • Red Hat JBoss Core Services 2.4.57
    fixed: vendor fix RHSA-2023:4628
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.57-5.el7jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el7jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el7jbcs, jbcs-httpd24-httpd-tools 2.4.57-5.el7jbcs, jbcs-httpd24-mod_session 2.4.57-5.el7jbcs, jbcs-httpd24-httpd-manual 2.4.57-5.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.57-5.el8jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el8jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el8jbcs, jbcs-httpd24-httpd-tools 2.4.57-5.el8jbcs, jbcs-httpd24-mod_session 2.4.57-5.el8jbcs, jbcs-httpd24-httpd-manual 2.4.57-5.el8jbcs, +2 more
    fixed: vendor fix RHSA-2023:4629
  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.7.0-8.el7jbcs, jbcs-httpd24-curl 8.2.1-1.el7jbcs, jbcs-httpd24-libcurl 8.2.1-1.el7jbcs, jbcs-httpd24-mod_md 2.4.0-25.el7jbcs, jbcs-httpd24-apr-util 1.6.1-102.el7jbcs, jbcs-httpd24-mod_http2 1.15.19-28.el7jbcs, +11 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-apr 1.7.0-8.el8jbcs, jbcs-httpd24-curl 8.2.1-1.el8jbcs, jbcs-httpd24-libcurl 8.2.1-1.el8jbcs, jbcs-httpd24-mod_md 2.4.0-25.el8jbcs, jbcs-httpd24-apr-util 1.6.1-102.el8jbcs, jbcs-httpd24-mod_http2 1.15.19-28.el8jbcs, +11 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-027-02 updated cvss 5.3

Festo Didactic SE MES PC

  • Festo Didactic SE MES PC shipped_with_Windows_10
    affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-133-01 updated cvss 5.3

Hitachi Energy Service Suite

  • Hitachi Energy Service Suite <=9.8.1.3
    affected: fixed in 9.8.1.4
  • Hitachi Energy Service Suite 9.8.1.4
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-046-11 updated cvss 5.3

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

52.72% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami apache
<2.4.55
2.4.55

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers
  • CWE-436 Interpretation Conflict
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.