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CVE-2011-4317

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...

4.3 MediumPublic exploitFix available

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Exploit likelihood

59.6%Down 9.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 4.3

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-4317
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-4317
Updated
2026-11-02
EUVDEUVD-2011-4251 No score

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
EUVD-2011-4251
Updated
2026-11-03
GitHub AdvisoriesGHSA-2m6p-rg3r-28gh No score

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...

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
GHSA-2m6p-rg3r-28gh
Weakness
CWE-20
Updated
2026-11-02
OSVBELL-CVE-2011-4317 4.3

CVE-2011-4317 does not affect BellSoft software

Record
BELL-CVE-2011-4317
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Updated
2026-11-02
OSV No score

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-4317
Updated
2026-11-02
OSVDEBIAN-CVE-2011-4317 No score

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, when the Revision 1179239 patch is in place, 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 @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
DEBIAN-CVE-2011-4317
Updated
2026-11-02
OSVopenSUSE-SU-2024:10268-1 No score

apache2-2.4.23-4.1 on GA media

These are all security issues fixed in the apache2-2.4.23-4.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10268-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache2
Debian:12
 before 2.2.21-3
2.2.21-3
apache2
Debian:13
 before 2.2.21-3
2.2.21-3
apache2
Debian:14
 before 2.2.21-3
2.2.21-3
apache2
Debian:6.0
From an advisory covering 6 CVEs
 before 2.2.16-6+squeeze6, plus listed versions
2.2.16-62.2.16-6+squeeze12.2.16-6+squeeze1~bpo50+12.2.16-6+squeeze22.2.16-6+squeeze2~bpo50+12.2.16-6+squeeze32.2.16-6+squeeze42.2.16-6+squeeze4~bpo50+1
2.2.16-6+squeeze6
apache2
Debian:5.0
From an advisory covering 6 CVEs
 before 2.2.9-10+lenny12, plus listed versions
2.2.9-10+lenny102.2.9-10+lenny112.2.9-10+lenny22.2.9-10+lenny32.2.9-10+lenny4
Show 5 moreShow less
2.2.9-10+lenny52.2.9-10+lenny62.2.9-10+lenny72.2.9-10+lenny82.2.9-10+lenny9
2.2.9-10+lenny12
httpd
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-debuginfo
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-tools
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-devel
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-manual
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
Show 20 moreShow less
Affected packages
PackageAffectedFixed
mod_ssl
Red Hat:enterprise_linux:6::client
From an advisory covering 5 CVEs
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-debuginfo
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-tools
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-devel
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-manual
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
mod_ssl
Red Hat:enterprise_linux:6::computenode
From an advisory covering 5 CVEs
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-debuginfo
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-devel
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-manual
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-tools
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
mod_ssl
Red Hat:enterprise_linux:6::server
From an advisory covering 5 CVEs
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-debuginfo
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-devel
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-manual
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
httpd-tools
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
mod_ssl
Red Hat:enterprise_linux:6::workstation
From an advisory covering 5 CVEs
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
apache2
openSUSE:Tumbleweed
From an advisory covering 48 CVEs
 before 2.4.23-4.1
2.4.23-4.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBApache 7.0.x mod_proxy - Reverse Proxy Security Bypass2011-11-24

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2011-4317 is a medium vulnerability (CVSS 4.3) in Apache Http Server, published November 30, 2011. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 59.6%, the 99th percentile. Fixed in apache2 2.2.21-3.

References

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