CVE-2011-3639

medium Apache
CVSS v3 Base Score
4.3
AV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS Score
8.6%
Exploitation probability in 30 days
Top 8% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
M
Confidentiality
None
Integrity
P
Availability
None
Published: November 30, 2011 (5279 days ago)
Last Modified: April 29, 2026
Vendor: Apache
Source: NVD

Description

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.

CWE

CWE-20

Affected Products

apache http serverapache http server2.0a1apache http server2.0a2apache http server2.0a3apache http server2.0a4apache http server2.0a5apache http server2.0a6apache http server2.0a7apache http server2.0a8apache http server2.0a9

References

🔗 rhn.redhat.com 🔗 svn.apache.org 🔗 www.debian.org 🔗 bugzilla.redhat.com 🔗 rhn.redhat.com