Description
The ap_proxy_http_process_response function in mod_proxy_http.c in the mod_proxy module in the Apache HTTP Server 2.0.63 and 2.2.8 does not limit the number of forwarded interim responses, which allows remote HTTP servers to cause a denial of service (memory consumption) via a large number of interim responses.
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 | 2.2.9-1 | — |
| Debian 13 | apache2 | 2.2.9-1 | — |
| Debian 12 | apache2 | 2.2.9-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | httpd +2 | 2.2.3-11.el5_2.4 | RHSA-2008:0967 |
| RHEL 5 | mod_ssl | 1:2.2.3-11.el5_2.4 | RHSA-2008:0967 |
| RHEL 4 | httpd +3 | 2.0.52-41.ent.2 | RHSA-2008:0967 |
| RHEL 4 | mod_ssl | 1:2.0.52-41.ent.2 | RHSA-2008:0967 |
| RHEL 3 | httpd +1 | 2.0.46-71.ent | RHSA-2008:0967 |
| RHEL 3 | mod_ssl | 1:2.0.46-71.ent | RHSA-2008:0967 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Application Stack 2 | httpd +2 | 2.2.10-1.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | mod_ssl | 1:2.2.10-1.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | mysql +6 | 5.0.60sp1-1.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | mysql-connector-odbc | 3.51.26r1127-1.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | perl-DBD-MySQL | 4.008-2.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | perl-DBD-Pg | 1.49-4.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | perl-DBI | 1.607-3.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | php-pear | 1:1.7.2-2.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | postgresql +11 | 8.2.11-1.el5s2 | RHSA-2008:0966 |
| Red Hat Rhel Application Stack 2 | postgresqlclient81 | 8.1.14-1.el5s2 | RHSA-2008:0966 |
| Red Hat Certificate System 7 | ant | 1.6.5-1jpp_1rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | avalon-logkit | 1.2-2jpp_4rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | axis | 1.2.1-1jpp_3rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | classpathx-jaf | 1.0-2jpp_6rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | classpathx-mail | 1.1.1-2jpp_8rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | geronimo-specs +10 | 1.0-0.M4.1jpp_10rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | jakarta-commons-modeler | 2.0-3jpp_2rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | log4j | 1.2.12-1jpp_1rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | mx4j | 1:3.0.1-1jpp_4rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | pcsc-lite +2 | 1.3.3-3.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-ca | 7.3.0-20.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-java-tools | 7.3.0-10.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-kra | 7.3.0-14.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-manage | 7.3.0-19.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-native-tools | 7.3.0-6.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | rhpki-tks +1 | 7.3.0-13.el4 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | tomcat5 +5 | 5.5.23-0jpp_4rh.16 | RHSA-2010:0602 |
| Red Hat Certificate System 7 | xerces-j2 | 2.7.1-1jpp_1rh | RHSA-2010:0602 |
| Red Hat Certificate System 7 | xml-commons +1 | 1.3.02-2jpp_1rh | RHSA-2010:0602 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.49-1.1 | openSUSE-SU-2024:10623-1 |
Advisories 4
- RHSA-2010:0602 Red Hat Security Advisory: Red Hat Certificate System 7.3 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2008:0967 Red Hat Security Advisory: httpd security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2008:0966 Red Hat Security Advisory: Red Hat Application Stack v2.2 security and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- openSUSE-SU-2024:10623-1 apache2-2.4.49-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- SUSE-SR:2009:007 vendor-advisory
- 34259 third-party-advisory
- 34219 third-party-advisory
- oval:org.mitre.oval:def:11713 vdb-entry signature
- 31026 third-party-advisory
- HPSBUX02465 vendor-advisory
- 31651 third-party-advisory
- 247666 vendor-advisory
- 31681 vdb-entry
- 32838 third-party-advisory
- 20081122 rPSA-2008-0328-1 httpd mod_ssl mailing-list
- 31904 third-party-advisory
- http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.html
- RHSA-2008:0967 vendor-advisory
- 29653 vdb-entry
- 34418 third-party-advisory
- 30621 third-party-advisory
- 32685 third-party-advisory
- apache-modproxy-module-dos(42987) vdb-entry
- SUSE-SR:2009:006 vendor-advisory
- 31416 third-party-advisory
- 1020267 vdb-entry
- http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/proxy/mod_proxy_http.c?r1=666154&r2=666153&pathrev=666154
- USN-731-1 vendor-advisory
- ADV-2009-0320 vdb-entry
- HPSBUX02365 vendor-advisory
- http://www-01.ibm.com/support/docview.wss?uid=swg27008517
- oval:org.mitre.oval:def:9577 vdb-entry signature
- 32222 third-party-advisory
- oval:org.mitre.oval:def:6084 vdb-entry signature
- RHSA-2008:0966 vendor-advisory
- 33156 third-party-advisory
- 33797 third-party-advisory
- 20080729 rPSA-2008-0236-1 httpd mod_ssl mailing-list
- 31404 third-party-advisory
- FEDORA-2008-6393 vendor-advisory
- GLSA-200807-06 vendor-advisory
- ADV-2008-2780 vdb-entry
- HPSBUX02401 vendor-advisory
- MDVSA-2008:237 vendor-advisory
- FEDORA-2008-6314 vendor-advisory
- ADV-2008-1798 vdb-entry
- APPLE-SA-2008-10-09 vendor-advisory
- http://support.apple.com/kb/HT3216
- MDVSA-2008:195 vendor-advisory
- PK67579 vendor-advisory
- http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0328
- [httpd-cvs] 20190815 svn commit: r1048742 [2/4] - 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 [2/4] - 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 [2/4] - 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 [2/4] - 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 [5/13] - /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 [5/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [2/4] - 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