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CVE-2011-3368

83
FAUCET Score

CVE-2011-3368 describes a vulnerability in the mod_proxy module of Apache HTTP Server versions 1.3.x, 2.0.x, and 2.2.x. This flaw allows remote attackers to bypass reverse proxy configurations, specifically RewriteRule and ProxyPassMatch patterns, by crafting a malformed URI starting with an '@' character, enabling requests to internal intranet servers. With a CVSS score of 5.0, this vulnerability is easily exploitable over the network with no authentication required, potentially leading to information disclosure. While not listed on CISA's KEV catalog, exploit modules are available in Metasploit and ExploitDB, indicating public awareness of exploitation methods, despite limited community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.3CPE matchmatch criteria
cpe:2.3:a:apache:http_server:1.3:*:*:*:*:*:*:*
1.3.0CPE matchmatch criteria
cpe:2.3:a:apache:http_server:1.3.0:*:*:*:*:*:*:*
1.3.1CPE matchmatch criteria
cpe:2.3:a:apache:http_server:1.3.1:*:*:*:*:*:*:*
1.3.1.1CPE matchmatch criteria
cpe:2.3:a:apache:http_server:1.3.1.1:*:*:*:*:*:*:*
1.3.2CPE matchmatch criteria
cpe:2.3:a:apache:http_server:1.3.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
90.73%
Probability of exploitation in next 30 days
EPSS Percentile
99.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-17969 · Oct 11, 2011
This CVE's current EPSS score of 0.9073 is in the 100th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: httpd-0:2.0.52-49.ent
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: httpd-0:2.2.3-53.el5_7.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: httpd-0:2.2.15-9.el6_1.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 5Fixed in: httpd-0:2.2.17-15.4.ep5.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 6Fixed in: httpd-0:2.2.17-15.4.ep5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 1.0
View patch
redhatend of lifevia redhat_api
Product: Red Hat Directory Server 8Fixed in: httpd

Vendor Advisories (1)

redhatCVE-2011-3368Moderate

httpd: reverse web proxy vulnerability

Oct 5, 2011

References

kb.juniper.net / JSA10585
lists.apple.com / archives/security-announce/2012/Sep/msg00004.html
lists.opensuse.org / opensuse-security-announce/2011-11/msg00011.html
lists.opensuse.org / opensuse-updates/2013-02/msg00009.html
lists.opensuse.org / opensuse-updates/2013-02/msg00012.html
marc.info
marc.info
osvdb.org / 76079
rhn.redhat.com / errata/RHSA-2012-0542.html
rhn.redhat.com / errata/RHSA-2012-0543.html
bugzilla.redhat.com / show_bug.cgi
ExploitPatch
seclists.org / fulldisclosure/2011/Oct/232
seclists.org / fulldisclosure/2011/Oct/273
secunia.com / advisories/46288
secunia.com / advisories/46414
secunia.com / advisories/48551
exchange.xforce.ibmcloud.com / vulnerabilities/70336
lists.apache.org / thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r064df0985779b7ee044d3120d71ba59750427cf53f57ba3384e3773f%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r688df6f16f141e966a0a47f817e559312b3da27886f59116a94b273d%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/re2e23465bbdb17ffe109d21b4f192e6b58221cd7aa8797d530b4cd75%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
support.apple.com / kb/HT5501
svn.apache.org / viewvc
Patch
web.archiveorange.com / archive/v/ZyS0hzECD5zzb2NkvQlt
ExploitPatch
www-01.ibm.com / support/docview.wss
www-01.ibm.com / support/docview.wss
contextis.com / research/blog/reverseproxybypass
debian.org / security/2012/dsa-2405
exploit-db.com / exploits/17969
mandriva.com / security/advisories
mandriva.com / security/advisories
oracle.com / technetwork/topics/security/cpujan2015-1972971.html
oracle.com / technetwork/topics/security/cpujul2012-392727.html
redhat.com / support/errata/RHSA-2011-1391.html
redhat.com / support/errata/RHSA-2011-1392.html
securityfocus.com / bid/49957
securitytracker.com / id