CVE-2011-3639 EXPLOIT
4.3
MEDIUM · CVSS 2.0 · EPSS 50.6% (pctl 99)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 4.3 (MEDIUM, v2.0) |
|---|---|
| Vector | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| EPSS | 50.6% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-20 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2011-11-30 |
| Last modified | 2026-06-16 |
Affected (10)
| Vendor | Product |
|---|---|
| apache | http server |
| apache | http server2.0a1 |
| apache | http server2.0a2 |
| apache | http server2.0a3 |
| apache | http server2.0a4 |
| apache | http server2.0a5 |
| apache | http server2.0a6 |
| apache | http server2.0a7 |
| apache | http server2.0a8 |
| apache | http server2.0a9 |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Apache 2.2.15 mod_proxy - Reverse Proxy Security Bypass | 2012-02-06 |
References
- http://rhn.redhat.com/errata/RHSA-2012-0128.html
- http://svn.apache.org/viewvc?view=revision&revision=1188745
- http://www.debian.org/security/2012/dsa-2405
- https://bugzilla.redhat.com/show_bug.cgi?id=752080
- http://rhn.redhat.com/errata/RHSA-2012-0128.html
- http://svn.apache.org/viewvc?view=revision&revision=1188745
- http://www.debian.org/security/2012/dsa-2405
- https://bugzilla.redhat.com/show_bug.cgi?id=752080
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