Description
The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.
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 | 2.4.10-3 | — |
| Debian 13 | apache2 | 2.4.10-3 | — |
| Debian 12 | apache2 | 2.4.10-3 | — |
| Debian 6.0 | apache2 | 2.2.16-6+squeeze14 | DLA-71-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.4 | USN-2523-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | httpd +5 | 2.4.6-31.el7 | RHSA-2015:0325 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-31.el7 | RHSA-2015:0325 |
| RHEL 1 | httpd24-httpd +5 | 2.4.6-22.el6 | RHSA-2014:1972 |
| RHEL 1 | httpd24-mod_ssl +1 | 1:2.4.6-22.el6 | RHSA-2014:1972 |
Show 1 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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | apache2 | 2.4.10-12.1 | SUSE-SU-2015:0974-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | apache2 | 2.4.10-12.1 | SUSE-SU-2015:0974-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.23-4.1 | openSUSE-SU-2024:10268-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | httpd +5 | 2.4.6-31.0.1.el7 | ELSA-2015-0325 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-31.0.1.el7 | ELSA-2015-0325 |
Advisories 9
- 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-2015:0325 Red Hat Security Advisory: httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2014:1972 Red Hat Security Advisory: httpd24-httpd security and bug fix update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-2523-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-71-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:0974-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10268-1 apache2-2.4.23-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2015-0325 Low: httpd security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 11, 2015
References
- http://svn.apache.org/viewvc?view=revision&revision=1624234
- GLSA-201610-02 vendor-advisory
- RHSA-2015:0325 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- USN-2523-1 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- 1031005 vdb-entry
- apache-cve20143581-dos(97027) vdb-entry
- http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?view=markup&pathrev=1627749
- APPLE-SA-2015-08-13-2 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1149709
- 71656 vdb-entry
- https://support.apple.com/kb/HT205031
- APPLE-SA-2015-09-16-4 vendor-advisory
- https://support.apple.com/HT205219
- [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] 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] 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 [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: 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] 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: r1075467 [2/2] - 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