Description
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.
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 | 2.4.16-1 | — |
| Debian 13 | apache2 | 2.4.16-1 | — |
| Debian 12 | apache2 | 2.4.16-1 | — |
| Debian 8 | apache2 | 2.4.10-10+deb8u1 | DSA-3325-1 |
| Debian 7 | apache2 | 2.2.22-13+deb7u5 | DSA-3325-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | apache2 | 2.2.16-6+squeeze15 | DLA-284-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.5 | USN-2686-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | httpd +5 | 2.4.6-31.ael7b_1.1 | RHSA-2015:1667 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-31.ael7b_1.1 | RHSA-2015:1667 |
| RHEL 6 | httpd +3 | 2.2.15-47.el6_7 | RHSA-2015:1668 |
| RHEL 6 | mod_ssl | 1:2.2.15-47.el6_7 | RHSA-2015:1668 |
| RHEL 2 | httpd24-httpd +5 | 2.4.12-4.el6.2 | RHSA-2015:1666 |
| RHEL 2 | httpd24-mod_ssl +1 | 1:2.4.12-4.el6.2 | RHSA-2015:1666 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 3 | apache-commons-collections-eap6 +1 | 3.2.1-18.redhat_7.1.ep6.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | httpd24 +5 | 2.4.6-59.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | mod_bmx | 0.9.5-7.GA.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | mod_cluster-native | 1.3.1-6.Final_redhat_2.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | mod_ssl24 +1 | 1:2.4.6-59.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | tomcat-vault | 1.0.8-4.Final_redhat_4.1.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | tomcat7 +9 | 7.0.59-42_patch_01.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 3 | tomcat8 +9 | 8.0.18-52_patch_01.ep7.el6 | RHSA-2015:2660, RHSA-2015:2659 |
| Red Hat JBoss Web Server 2 | httpd +3 | 2.2.26-41.ep6.el5 | RHSA-2016:0061 |
| Red Hat JBoss Web Server 2 | httpd22 +3 | 2.2.26-42.ep6.el7 | RHSA-2016:0061 |
| Red Hat JBoss Web Server 2 | mod_cluster-native | 1.2.9-6.Final_redhat_2.ep6.el5 | RHSA-2016:0061 |
| Red Hat JBoss Web Server 2 | mod_ssl | 1:2.2.26-41.ep6.el5 | RHSA-2016:0061 |
| Red Hat JBoss Web Server 2 | mod_ssl22 | 1:2.2.26-42.ep6.el7 | RHSA-2016:0061 |
| Red Hat JBoss EAP 6 | hornetq-native +1 | 2.3.25-4.SP11_redhat_1.ep6.el6 | RHSA-2016:2055, RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | httpd +4 | 2.2.26-54.ep6.el6 | RHSA-2016:2055 |
| Red Hat JBoss EAP 6 | httpd22 +4 | 2.2.26-56.ep6.el7 | RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | jbcs-httpd24 +1 | 1-3.jbcs.el6 | RHSA-2016:2055, RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | jbcs-httpd24-openssl +4 | 1:1.0.2h-4.jbcs.el6 | RHSA-2016:2055, RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | mod_cluster-native | 1.2.13-3.Final_redhat_2.ep6.el6 | RHSA-2016:2055, RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | mod_jk +1 | 1.2.41-2.redhat_4.ep6.el6 | RHSA-2016:2055, RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | mod_ssl | 1:2.2.26-54.ep6.el6 | RHSA-2016:2055 |
| Red Hat JBoss EAP 6 | mod_ssl22 | 1:2.2.26-56.ep6.el7 | RHSA-2016:2054 |
| Red Hat JBoss EAP 6 | tomcat-native +1 | 1.1.34-5.redhat_1.ep6.el6 | RHSA-2016:2055, RHSA-2016:2054 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | apache2 | 2.4.10-14.10.1 | SUSE-SU-2015:1851-1 |
| SLES 12 | apache2-mod_auth_kerb | 5.4-2.4.1 | SUSE-SU-2015:1851-1 |
| SLES 12 | apache2-mod_jk | 1.2.40-2.6.1 | SUSE-SU-2015:1851-1 |
| SLES 12 | apache2-mod_security2 | 2.8.0-3.4.1 | SUSE-SU-2015:1851-1 |
| SLES 11 SP4 | apache2 | 2.2.12-59.1 | SUSE-SU-2015:1885-2, SUSE-SU-2015:1885-1 |
| SLES 11 SP3 | apache2 | 2.2.12-59.1 | SUSE-SU-2015:1885-2, SUSE-SU-2015:1885-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | apache2 | 2.2.12-59.1 | SUSE-SU-2015:1885-2 |
| SLES for SAP 12 | apache2 | 2.4.10-14.10.1 | SUSE-SU-2015:1851-1 |
| SLES for SAP 12 | apache2-mod_auth_kerb | 5.4-2.4.1 | SUSE-SU-2015:1851-1 |
| SLES for SAP 12 | apache2-mod_jk | 1.2.40-2.6.1 | SUSE-SU-2015:1851-1 |
| SLES for SAP 12 | apache2-mod_security2 | 2.8.0-3.4.1 | SUSE-SU-2015:1851-1 |
| SLES for SAP 11 SP4 | apache2 | 2.2.12-59.1 | SUSE-SU-2015:1885-2, SUSE-SU-2015:1885-1 |
| SLES for SAP 11 SP3 | apache2 | 2.2.12-59.1 | SUSE-SU-2015:1885-2, SUSE-SU-2015:1885-1 |
| SUSE Enterprise Storage 1.0 | apache2-mod_fastcgi | 2.4.7-3.4.1 | SUSE-SU-2015:1851-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | httpd +5 | 2.4.6-31.0.1.el7_1.1 | ELSA-2015-1667 |
| Oracle Linux 7 | httpd24-httpd +5 | 2.4.12-6.0.1.el7.1 | ELSA-2015-1666 |
| Oracle Linux 7 | httpd24-mod_ssl +1 | 1:2.4.12-6.0.1.el7.1 | ELSA-2015-1666 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-31.0.1.el7_1.1 | ELSA-2015-1667 |
Advisories 16
- RHSA-2016:2055 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 6.4.10 natives update on RHEL 6 Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2016:2054 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 6.4.10 natives update on RHEL 7 Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2015:1667 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2015:1666 Red Hat Security Advisory: httpd24-httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2015:2660 Red Hat Security Advisory: Red Hat JBoss Web Server 3.0.2 security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2015:2659 Red Hat Security Advisory: Red Hat JBoss Web Server 3.0.2 security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2016:0061 Red Hat Security Advisory: httpd and httpd22 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2015:1668 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-2686-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3325-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-284-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:1885-2 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1885-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1851-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2015-1666 Moderate: httpd24-httpd security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 4, 2016
- ELSA-2015-1667 Moderate: httpd security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 24, 2015
References
- HPSBUX03512 vendor-advisory
- RHSA-2016:2056 vendor-advisory
- openSUSE-SU-2015:1684 vendor-advisory
- http://httpd.apache.org/security/vulnerabilities_24.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- RHSA-2016:0061 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- GLSA-201610-02 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- RHSA-2015:1667 vendor-advisory
- RHSA-2016:0062 vendor-advisory
- http://www.apache.org/dist/httpd/CHANGES_2.4
- RHSA-2015:1666 vendor-advisory
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04832246
- 1032967 vdb-entry
- RHSA-2015:1668 vendor-advisory
- RHSA-2015:2661 vendor-advisory
- RHSA-2016:2055 vendor-advisory
- USN-2686-1 vendor-advisory
- APPLE-SA-2015-08-13-2 vendor-advisory
- 75963 vdb-entry
- DSA-3325 vendor-advisory
- RHSA-2015:2659 vendor-advisory
- https://github.com/apache/httpd/commit/e427c41257957b57036d5a549b260b6185d1dd73
- https://puppet.com/security/cve/CVE-2015-3183
- 91787 vdb-entry
- RHSA-2015:2660 vendor-advisory
- RHSA-2016:2054 vendor-advisory
- https://support.apple.com/kb/HT205031
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04926789
- APPLE-SA-2015-09-16-4 vendor-advisory
- https://support.apple.com/HT205219
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- [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
- [httpd-cvs] 20190815 svn commit: r1048743 [3/4] - 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 [3/4] - 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: r1058586 [3/4] - 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: 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
- [httpd-cvs] 20200401 svn commit: r1058587 [3/4] - 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://github.com/apache/httpd/commit/a6027e56924bb6227c1fdbf6f91e7e2438338be6
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [9/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [3/4] - 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: 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: r1888194 [9/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html 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: r1073146 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [10/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - 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