Description
The ap_proxy_ajp_request function in mod_proxy_ajp.c in mod_proxy_ajp in the Apache HTTP Server 2.2.x before 2.2.15 does not properly handle certain situations in which a client sends no request body, which allows remote attackers to cause a denial of service (backend server outage) via a crafted request, related to use of a 500 error code instead of the appropriate 400 error code.
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 | 2.2.15-1 | — |
| Debian 13 | apache2 | 2.2.15-1 | — |
| Debian 12 | apache2 | 2.2.15-1 | — |
| Debian 5.0 | apache2 | 2.2.9-10+lenny7 | DSA-2035-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | httpd +2 | 2.2.3-31.el5_4.4 | RHSA-2010:0168 |
| RHEL 5 | mod_ssl | 1:2.2.3-31.el5_4.4 | RHSA-2010:0168 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 1 | httpd +2 | 2.2.14-1.2.6.jdk6.ep5.el5 | RHSA-2010:0396 |
| Red Hat JBoss Web Server 1 | httpd22 +6 | 2.2.14-11.jdk6.ep5.el4 | RHSA-2010:0396 |
| Red Hat JBoss Web Server 1 | mod_ssl | 1:2.2.14-1.2.6.jdk6.ep5.el5 | RHSA-2010:0396 |
| Red Hat JBoss Web Server 1 | mod_ssl22 | 1:2.2.14-11.jdk6.ep5.el4 | RHSA-2010:0396 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.23-4.1 | openSUSE-SU-2024:10268-1 |
Advisories 4
- RHSA-2010:0168 Red Hat Security Advisory: httpd security and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2035-1 apache2 - several issues Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10268-1 apache2-2.4.23-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2010:0396 Red Hat Security Advisory: httpd and httpd22 security and enhancement update Red Hat Security Advisories (RHSA) · Jan 14, 2026
References
- ADV-2010-1411 vdb-entry
- ADV-2010-0911 vdb-entry
- 39628 third-party-advisory
- MDVSA-2010:053 vendor-advisory
- oval:org.mitre.oval:def:9935 vdb-entry signature
- http://support.apple.com/kb/HT4435
- PM12247 vendor-advisory
- FEDORA-2010-6131 vendor-advisory
- HPSBUX02531 vendor-advisory
- PM15829 vendor-advisory
- 39656 third-party-advisory
- RHSA-2010:0168 vendor-advisory
- APPLE-SA-2010-11-10-1 vendor-advisory
- 39100 third-party-advisory
- 39501 third-party-advisory
- SUSE-SR:2010:010 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
- http://httpd.apache.org/security/vulnerabilities_22.html
- 40096 third-party-advisory
- http://svn.apache.org/viewvc?view=revision&revision=917876
- 39632 third-party-advisory
- DSA-2035 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=569905
- 38491 vdb-entry
- oval:org.mitre.oval:def:8619 vdb-entry signature
- http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/modules/proxy/mod_proxy_ajp.c?r1=917876&r2=917875&pathrev=917876
- MDVSA-2013:150 vendor-advisory
- PM08939 vendor-advisory
- FEDORA-2010-5942 vendor-advisory
- ADV-2010-1001 vdb-entry
- ADV-2010-0994 vdb-entry
- ADV-2010-1057 vdb-entry
- [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: 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
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [6/13] - /httpd/site/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: r1073139 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [7/13] - in /websites/staging/httpd/trunk/content: ./ security/ 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] 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