--- title: "CVE-2011-3368: The mod_proxy module in the Apache HTTP… | CubePath" description: "The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use…" language: en source: https://cubepath.com/security/cve/CVE-2011-3368 --- # CVE-2011-3368: The mod_proxy module in the Apache HTTP… | CubePath ## Description The mod\_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character. Official description from the CVE record, published by redhat. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2011-3368) ## Key data ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.90734 (90.7% probability) Percentile 99.8% Scores of Nov 10, 2026 Model v2026.06.15 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [\[announce\] 20111005 Advisory: mod\_proxy reverse proxy exposure (CVE-2011-3368)](http://web.archiveorange.com/archive/v/ZyS0hzECD5zzb2NkvQlt) (web.archiveorange.com) mailing-list - [svn.apache.org/viewvc?view=revision&revision=1179239](http://svn.apache.org/viewvc?view=revision&revision=1179239) - [SSRT100966](http://marc.info/?l=bugtraq&m=134987041210674&w=2) (marc.info) vendor-advisory - [contextis.com/research/blog/reverseproxybypass](http://www.contextis.com/research/blog/reverseproxybypass/) - [20111005 Context IS Advisory - Apache Reverse Proxy Bypass Vulnerability](http://seclists.org/fulldisclosure/2011/Oct/273) (seclists.org) mailing-list - [RHSA-2011:1391](http://www.redhat.com/support/errata/RHSA-2011-1391.html) (redhat.com) vendor-advisory - [SE49724](http://www-01.ibm.com/support/docview.wss?uid=nas2b7c57b1f1035675186257927003c8d48) (www-01.ibm.com) vendor-advisory - [RHSA-2012:0543](http://rhn.redhat.com/errata/RHSA-2012-0543.html) (rhn.redhat.com) vendor-advisory - [46288](http://secunia.com/advisories/46288) (secunia.com) third-party-advisory - [76079](http://osvdb.org/76079) (osvdb.org) vdb-entry - [17969](http://www.exploit-db.com/exploits/17969) (exploit-db.com) exploit - [SSRT100772](http://marc.info/?l=bugtraq&m=133294460209056&w=2) (marc.info) vendor-advisory - [oracle.com/technetwork/topics/security/cpujan2015-1972971.h…](http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html) - [49957](http://www.securityfocus.com/bid/49957) (securityfocus.com) vdb-entry - [SE49723](http://www-01.ibm.com/support/docview.wss?uid=nas2064c7e5f53452ff686257927003c8d42) (www-01.ibm.com) vendor-advisory - [RHSA-2012:0542](http://rhn.redhat.com/errata/RHSA-2012-0542.html) (rhn.redhat.com) vendor-advisory - [APPLE-SA-2012-09-19-2](http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html) (lists.apple.com) vendor-advisory - [support.apple.com/kb/HT5501](http://support.apple.com/kb/HT5501) - [apache-modproxy-information-disclosure(70336)](https://exchange.xforce.ibmcloud.com/vulnerabilities/70336) (exchange.xforce.ibmcloud.com) vdb-entry - [oracle.com/technetwork/topics/security/cpujul2012-392727.ht…](http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html) - [bugzilla.redhat.com/show\_bug.cgi?id=740045](https://bugzilla.redhat.com/show%5Fbug.cgi?id=740045) - [1026144](http://www.securitytracker.com/id?1026144) (securitytracker.com) vdb-entry - [RHSA-2011:1392](http://www.redhat.com/support/errata/RHSA-2011-1392.html) (redhat.com) vendor-advisory - [20111005 Apache HTTP Server: mod\_proxy reverse proxy exposure (CVE-2011-3368)](http://seclists.org/fulldisclosure/2011/Oct/232) (seclists.org) mailing-list - [openSUSE-SU-2013:0248](http://lists.opensuse.org/opensuse-updates/2013-02/msg00012.html) (lists.opensuse.org) vendor-advisory - [MDVSA-2011:144](http://www.mandriva.com/security/advisories?name=MDVSA-2011:144) (mandriva.com) vendor-advisory - [openSUSE-SU-2013:0243](http://lists.opensuse.org/opensuse-updates/2013-02/msg00009.html) (lists.opensuse.org) vendor-advisory - [MDVSA-2013:150](http://www.mandriva.com/security/advisories?name=MDVSA-2013:150) (mandriva.com) vendor-advisory - [46414](http://secunia.com/advisories/46414) (secunia.com) third-party-advisory - [48551](http://secunia.com/advisories/48551) (secunia.com) third-party-advisory - [DSA-2405](http://www.debian.org/security/2012/dsa-2405) (debian.org) vendor-advisory - [SUSE-SU-2011:1229](http://lists.opensuse.org/opensuse-security-announce/2011-11/msg00011.html) (lists.opensuse.org) vendor-advisory - [kb.juniper.net/JSA10585](http://kb.juniper.net/JSA10585) - [\[httpd-cvs\] 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073139 \[1/13\] - in /websites/staging/httpd/trunk/content: ./ security/json/](https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073140 \[1/4\] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities\_13.html security/vulnerabilities\_20.html security/vulnerabilities\_22.html security/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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.html](https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1888194 \[7/13\] - /httpd/site/trunk/content/security/json/](https://lists.apache.org/thread.html/r688df6f16f141e966a0a47f817e559312b3da27886f59116a94b273d%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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.html](https://lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073143 \[2/3\] - in /websites/staging/httpd/trunk/content: ./ security/](https://lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073139 \[7/13\] - in /websites/staging/httpd/trunk/content: ./ security/json/](https://lists.apache.org/thread.html/re2e23465bbdb17ffe109d21b4f192e6b58221cd7aa8797d530b4cd75%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073149 \[8/13\] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/](https://lists.apache.org/thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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](https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210330 svn commit: r1073149 \[1/13\] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/](https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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](https://lists.apache.org/thread.html/r064df0985779b7ee044d3120d71ba59750427cf53f57ba3384e3773f%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210603 svn commit: r1075360 \[1/3\] - 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-cvs\] 20210606 svn commit: r1075467 \[1/2\] - 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) 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/vulnerabilities\_24.html](https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list ## Timeline 1. ID reserved Aug 30, 2011 2. Record published Oct 5, 2011 3. Record last updated Aug 6, 2024 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:58 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)