Description
Stack consumption vulnerability in the fnmatch implementation in apr_fnmatch.c in the Apache Portable Runtime (APR) library before 1.4.3 and the Apache HTTP Server before 2.2.18, and in fnmatch.c in libc in NetBSD 5.1, OpenBSD 4.8, FreeBSD, Apple Mac OS X 10.6, Oracle Solaris 10, and Android, allows context-dependent attackers to cause a denial of service (CPU and memory consumption) via *? sequences in the first argument, as demonstrated by attacks against mod_autoindex in httpd.
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 | apr | 1.4.4-1 | — |
| Debian 13 | apr | 1.4.4-1 | — |
| Debian 12 | apr | 1.4.4-1 | — |
| Debian 6.0 | apr | 1.4.2-6+squeeze2 | DSA-2237-2 |
| Debian 5.0 | apr | 1.2.12-5+lenny4 | DSA-2237-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | apr +1 | 1.3.9-3.el6_0.1 | RHSA-2011:0507 |
| RHEL 5 | apr +2 | 1.2.7-11.el5_6.4 | RHSA-2011:0507 |
| RHEL 4 | apr +1 | 0.9.4-25.el4 | RHSA-2011:0507 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 1 | ant | 1.7.1-13.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | ant-commons-net | 1.7.1-14.ep5.el6 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | ant-jmf +16 | 1.7.1-13.jdk6.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | antlr | 2.7.7-7.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | bcel | 5.2-8.1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | cglib | 2.2-5.1.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | dom4j | 1.6.1-11.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | ecj | 1:3.3.1.1-3.2.2.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | ecj3 | 1:3.3.1.1-3.1.1.1.jdk6.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | glassfish-jaf | 1.1.0-6.1.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | glassfish-javamail | 1.4.2-0.4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | glassfish-jsf | 1.2_13-2.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | hibernate3 +1 | 1:3.3.2-1.4.GA_CP04.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | hibernate3-annotations +1 | 3.4.0-3.2.GA_CP04.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | hibernate3-commons-annotations +1 | 3.1.0-1.8.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | hibernate3-ejb-persistence-3.0-api +1 | 1:1.0.2-3.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | hibernate3-entitymanager +1 | 3.4.0-4.3.GA_CP04.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | httpd +2 | 2.2.17-11.1.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | httpd-tools | 2.2.17-11.2.ep5.el6 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | httpd22 +6 | 2.2.17-14.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-beanutils | 1.8.0-4.1.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-chain | 1.2-2.2.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-codec | 1.3-9.1.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-collections +1 | 3.2.1-4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-daemon | 1:1.0.5-1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-daemon-jsvc | 1:1.0.5-1.4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-dbcp +1 | 1.2.1-16.2.ep5.el6 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-digester | 1.8.1-8.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-el | 1.0-19.2.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-fileupload | 1:1.1.1-7.4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-httpclient | 1:3.1-1.1.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-io | 1.4-1.3.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-launcher | 1.1-4.6.1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-logging +1 | 1.1.1-0.4.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-logging-jboss | 1.1-10.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-modeler | 2.0-4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-pool +1 | 1.3-11.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-commons-validator | 1.3.1-7.5.1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-oro | 2.0.8-3.3.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jakarta-taglibs-standard | 1.1.1-9.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | javassist | 3.12.0-1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jboss-common-core | 2.2.17-1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jboss-common-logging-jdk +1 | 2.1.2-1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jboss-javaee +3 | 5.0.1-2.9.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jcommon | 1.0.16-1.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | jfreechart | 1.0.13-2.3.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | log4j | 1.2.14-18.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | mod_cluster +5 | 1.0.10-2.GA_CP01.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | mod_jk +2 | 1.2.31-1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | mod_ssl | 1:2.2.17-11.1.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | mod_ssl22 | 1:2.2.17-14.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | mx4j | 1:3.0.1-9.3.4.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | objectweb-asm | 3.1-5.3.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | objectweb-asm31 | 3.1-12.1.ep5.el6 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | regexp | 1.5-1.2.1.jdk6.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | struts12 | 1.2.9-3.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | tomcat-jkstatus-ant | 1.2.31-2.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | tomcat-native | 1.1.20-2.0.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | tomcat5 +12 | 5.5.33-14_patch_04.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | tomcat6 +9 | 6.0.32-14_patch_03.ep5.el6 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | xalan-j2 | 2.7.1-5.3_patch_04.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | xerces-j2 | 2.9.1-3.patch01.1.ep5.el4 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | xml-commons +3 | 1.3.04-7.10.jdk6.ep5.el5 | RHSA-2011:0897 |
| Red Hat JBoss Web Server 1 | xml-commons-which10 +4 | 1.3.04-7.14.ep5.el6 | RHSA-2011:0897 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apr | 1.5.2-3.4 | openSUSE-SU-2024:11596-1, openSUSE-SU-2024:10063-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Apache 1.4/2.2.x - APR 'apr_fnmatch()' Denial of Service EDB-35738 · dos · May 12, 2011 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 5
- RHSA-2011:0897 Red Hat Security Advisory: JBoss Enterprise Web Server 1.0.2 update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2011:0507 Red Hat Security Advisory: apr security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- DSA-2237-2 apr - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10063-1 libapr1-1.5.2-3.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11596-1 apr-devel-1.7.0-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 44574 third-party-advisory
- HPSBUX02707 vendor-advisory
- SSRT100966 vendor-advisory
- [dev] 20110511 Re: Apache Portable Runtime 1.4.4 [...] Released mailing-list
- 48308 third-party-advisory
- 20110512 Multiple Vendors libc/fnmatch(3) DoS (incl apache) third-party-advisory
- HPSBUX02702 vendor-advisory
- SSRT100619 vendor-advisory
- oval:org.mitre.oval:def:14804 vdb-entry signature
- http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.html
- http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/gen/fnmatch.c#rev1.22
- http://cxib.net/stuff/apr_fnmatch.txts
- oval:org.mitre.oval:def:14638 vdb-entry signature
- 1025527 vdb-entry
- http://svn.apache.org/viewvc?view=revision&revision=1098188
- http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gen/fnmatch.c#rev1.15
- http://www.apache.org/dist/apr/CHANGES-APR-1.4
- http://www.apache.org/dist/apr/Announcement1.x.html
- http://svn.apache.org/viewvc?view=revision&revision=1098799
- APPLE-SA-2011-10-12-3 vendor-advisory
- http://httpd.apache.org/security/vulnerabilities_22.html
- http://svn.apache.org/viewvc/apr/apr/branches/1.4.x/strings/apr_fnmatch.c?r1=731029&r2=1098902
- 8246 third-party-advisory
- DSA-2237 vendor-advisory
- RHSA-2011:0897 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=703390
- 44564 third-party-advisory
- http://www.apache.org/dist/httpd/Announcement2.2.html
- http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html
- 44490 third-party-advisory
- http://cxib.net/stuff/apache.fnmatch.phps
- RHSA-2011:0896 vendor-advisory
- http://support.apple.com/kb/HT5002
- MDVSA-2011:084 vendor-advisory
- [dev] 20110510 Re: Apache Portable Runtime 1.4.4 [...] Released mailing-list
- MDVSA-2013:150 vendor-advisory
- RHSA-2011:0507 vendor-advisory
- SUSE-SU-2011:1229 vendor-advisory
- [dev] 20110510 Re: fnmatch rewrite in apr, apr 1.4.3 mailing-list
- [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: 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: r1888194 [7/13] - /httpd/site/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
- [httpd-cvs] 20210330 svn commit: r1073143 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [7/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [8/13] - 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] 20210330 svn commit: r1888222 - in /httpd/site/trunk/content/security/json: CVE-2010-2068.json CVE-2010-2791.json CVE-2011-0419.json CVE-2011-3368.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