CVE-2011-3639
EPSS 52.5%
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.
How to fix CVE-2011-3639
To remediate CVE-2011-3639, upgrade the affected package to a fixed version below.
- Debian/apache2—upgrade to 2.2.18-1 or later
Is CVE-2011-3639 being exploited?
Likely — EPSS is 52.5%, placing CVE-2011-3639 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (1)
- from 0, < 2.2.18-1