Description
A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account for duplicates in regular expressions while other aspects of the servers processing will implicitly collapse them.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.0 to 2.4.38 | — |
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 | 2.4.38-3 | — |
| Debian 13 | apache2 | 2.4.38-3 | — |
| Debian 12 | apache2 | 2.4.38-3 | — |
| Debian 9 | apache2 | 2.4.25-3+deb9u7 | DSA-4422-1 |
| Debian 8 | apache2 | 2.4.10-10+deb8u14 | DLA-1748-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.6 | USN-3937-1 |
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.10 | USN-3937-1 |
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22 | USN-3937-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +7 | 2.4.37-16.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 8 | mod_http2 | 1.11.3-3.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-16.module+el8.1.0+4134+e6bad0ed | RHSA-2019:3436 |
| RHEL 7 | httpd +5 | 2.4.6-90.el7 | RHSA-2019:2343 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-90.el7 | RHSA-2019:2343 |
| RHEL 3 | httpd24 +3 | 1.1-19.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-15.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-mod_md | 2.4.34-15.el7 | RHSA-2019:4126 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-15.el6 | RHSA-2019:4126 |
| RHEL 3 | httpd24-nghttp2 +2 | 1.7.1-8.el6 | RHSA-2019:4126 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-73.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-54.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-brotli +1 | 1.0.6-9.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 7.64.1-21.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.37-41.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-jansson +1 | 2.11-24.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.12-13.Final_redhat_2.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 1.11.3-8.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.46-26.redhat_1.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.0.8-10.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.2-20.GA.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.37-41.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.39.2-10.jbcs.el6 | RHSA-2020:0250 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1c-4.jbcs.el6 | RHSA-2020:0250 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | apache2 | 2.4.33-3.15.1 | SUSE-SU-2019:0873-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES 12 SP1 | apache2 | 2.4.16-20.24.1 | SUSE-SU-2019:0888-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | apache2 | 2.4.10-14.36.1 | SUSE-SU-2019:0889-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SLES for SAP 12 SP1 | apache2 | 2.4.16-20.24.1 | SUSE-SU-2019:0888-2 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
| SUSE Enterprise Storage 4 | apache2 | 2.4.23-29.40.1 | SUSE-SU-2019:0878-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | apache2 | 2.4.33-lp150.2.17.1 | openSUSE-SU-2019:1209-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.39-r0 | — |
| Alpine v3.23 | apache2 | 2.4.39-r0 | — |
| Alpine v3.22 | apache2 | 2.4.39-r0 | — |
| Alpine v3.21 | apache2 | 2.4.39-r0 | — |
| Alpine v3.20 | apache2 | 2.4.39-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.39-r0 | — |
| Alpine v3.18 | apache2 | 2.4.39-r0 | — |
| Alpine v3.17 | apache2 | 2.4.39-r0 | — |
| Alpine v3.16 | apache2 | 2.4.39-r0 | — |
| Alpine v3.15 | apache2 | 2.4.39-r0 | — |
| Alpine v3.14 | apache2 | 2.4.39-r0 | — |
| Alpine v3.13 | apache2 | 2.4.39-r0 | — |
| Alpine v3.12 | apache2 | 2.4.39-r0 | — |
| Alpine v3.11 | apache2 | 2.4.39-r0 | — |
| Alpine v3.10 | apache2 | 2.4.39-r0 | — |
| Alpine v3.9 | apache2 | 2.4.39-r0 | — |
| Alpine v3.8 | apache2 | 2.4.39-r0 | — |
| Alpine v3.7 | apache2 | 2.4.39-r0 | — |
| Alpine v3.6 | apache2 | 2.4.39-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.39-1.amzn2.0.1 | ALAS2-2019-1189 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.39-1.amzn2.0.1 | ALAS2-2019-1189 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +7 | 2.4.37-16.0.1.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 8 | mod_http2 | 1.11.3-3.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-16.0.1.module+el8.1.0+5385+dcd9ff33 | ELSA-2019-3436 |
| Oracle Linux 7 | httpd +5 | 2.4.6-90.0.1.el7 | ELSA-2019-2343 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-90.0.1.el7 | ELSA-2019-2343 |
Advisories 19
- RHSA-2020:0250 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP1 Security Update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:4126 Red Hat Security Advisory: httpd24-httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3436 Red Hat Security Advisory: httpd:2.4 security and bug fix update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:2343 Red Hat Security Advisory: httpd security and bug fix update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3937-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4422-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1748-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0878-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0889-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0873-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1209-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0888-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0888-2 Security update for apache2 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2047 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 13, 2023
- WID-SEC-2023-1969 HPE Fabric OS: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Aug 6, 2023
- WID-SEC-2023-1594 IBM Tivoli Network Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2023
- ELSA-2019-3436 Moderate: httpd:2.4 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ELSA-2019-2343 Moderate: httpd security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 13, 2019
- ALAS2-2019-1189 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 20, 2019
References
- [oss-security] 20190401 CVE-2019-0220: URL normalization inconsistincies mailing-list
- 107670 vdb-entry
- 20190403 [SECURITY] [DSA 4422-1] apache2 security update mailing-list
- [debian-lts-announce] 20190403 [SECURITY] [DLA 1748-1] apache2 security update mailing-list
- USN-3937-1 vendor-advisory
- FEDORA-2019-cf7695b470 vendor-advisory
- DSA-4422 vendor-advisory
- FEDORA-2019-119b14075a vendor-advisory
- openSUSE-SU-2019:1190 vendor-advisory
- openSUSE-SU-2019:1209 vendor-advisory
- openSUSE-SU-2019:1258 vendor-advisory
- FEDORA-2019-a4ed7400f4 vendor-advisory
- RHSA-2019:2343 vendor-advisory
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- RHSA-2019:3436 vendor-advisory
- RHSA-2019:4126 vendor-advisory
- RHSA-2020:0250 vendor-advisory
- RHSA-2020:0251 vendor-advisory
- [httpd-bugs] 20200325 [Bug 63437] MergeSlashes option breaks protocol specifier in URIs mailing-list
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://support.f5.com/csp/article/K44591505
- https://security.netapp.com/advisory/ntap-20190625-0007/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03950en_us
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [12/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210603 svn commit: r1075360 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- https://www.oracle.com/security-alerts/cpujul2022.html