Every CVE Search/ Get API key

CVE-2011-3639

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when...

4.3 MediumPublic exploitFix available

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Exploit likelihood

49.7%Up 43.2 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 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-3639
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 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-3639
Updated
2026-11-02
EUVDEUVD-2011-3598 No score

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
EUVD-2011-3598
Updated
2026-11-03
GitHub AdvisoriesGHSA-rqg3-pfxx-wwq3 No score

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when...

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
GHSA-rqg3-pfxx-wwq3
Weakness
CWE-20
Updated
2026-11-02
OSVBELL-CVE-2011-3639 4.3

CVE-2011-3639 does not affect BellSoft software

Record
BELL-CVE-2011-3639
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 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
CVE-2011-3639
Updated
2026-11-02
OSVDEBIAN-CVE-2011-3639 No score

The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Record
DEBIAN-CVE-2011-3639
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache2
Debian:12
 before 2.2.18-1
2.2.18-1
apache2
Debian:13
 before 2.2.18-1
2.2.18-1
apache2
Debian:14
 before 2.2.18-1
2.2.18-1
apache2
Debian:6.0
 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
 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
 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
 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
 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
 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
 before 0:2.2.15-15.el6_2.1
0:2.2.15-15.el6_2.1
Show 31 moreShow less
Affected packages
PackageAffectedFixed
mod_ssl
Red Hat:enterprise_linux:6::client
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::computenode
 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
 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
 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
 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
 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
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::server
 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
 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
 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
 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
 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
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:6::workstation
 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
 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
 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
 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
 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
 before 1:2.2.15-15.el6_2.1
1:2.2.15-15.el6_2.1
httpd
Red Hat:enterprise_linux:5::client
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
mod_ssl
Red Hat:enterprise_linux:5::client
 before 1:2.2.3-63.el5_8.1
1:2.2.3-63.el5_8.1
httpd
Red Hat:enterprise_linux:5::client_workstation
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-debuginfo
Red Hat:enterprise_linux:5::client_workstation
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-devel
Red Hat:enterprise_linux:5::client_workstation
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-manual
Red Hat:enterprise_linux:5::client_workstation
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd
Red Hat:enterprise_linux:5::server
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-devel
Red Hat:enterprise_linux:5::server
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
httpd-manual
Red Hat:enterprise_linux:5::server
 before 0:2.2.3-63.el5_8.1
0:2.2.3-63.el5_8.1
mod_ssl
Red Hat:enterprise_linux:5::server
 before 1:2.2.3-63.el5_8.1
1:2.2.3-63.el5_8.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBApache 2.2.15 mod_proxy - Reverse Proxy Security Bypass2012-02-06

History

History
RecordedChangedSources
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-2011-3639 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 49.7%, the 98th percentile. Fixed in apache2 2.2.18-1.

References

Show 28 moreShow less
Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open