Skip to content
Fencer Intel
medium 5.0

CVE-2011-3368 json

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 does not properly inter…

published 2011-10-05 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-3332

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
90.7%
EPSS 90.7% chance of exploitation in 30 days, percentile 99.8%
public exploits
2
Metasploit, Exploit-DB

Summary

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 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 initial @ (at sign) character.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.2.21-2

debian advisories DEBIAN-CVE-2011-3368

  • httpd jboss enterprise web server 1 2.2.17-15.4.ep5.el5
  • httpd jboss enterprise web server 1 2.2.17-15.4.ep5.el6
  • mod_ssl jboss enterprise web server 1 1:2.2.17-15.4.ep5.el5
  • mod_ssl jboss enterprise web server 1 1:2.2.17-15.4.ep5.el6
  • httpd-tools jboss enterprise web server 1 2.2.17-15.4.ep5.el6
  • httpd-manual jboss enterprise web server 1 2.2.17-15.4.ep5.el5
  • httpd-manual jboss enterprise web server 1 2.2.17-15.4.ep5.el6
  • httpd RHEL 4 2.0.52-49.ent

red hat advisories RHSA-2012:0542RHSA-2011:1392RHSA-2011:1391

  • apache2 openSUSE Tumbleweed 2.4.23-4.1

opensuse advisories openSUSE-SU-2024:10268-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-3368 updated cvss 2.6

httpd: reverse web proxy vulnerability

  • Red Hat Directory Server 8 httpd
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux (v. 5 server) httpd 2.2.3-53.el5_7.3, mod_ssl 2.2.3-53.el5_7.3, httpd-manual 2.2.3-53.el5_7.3 Red Hat Enterprise Linux AS version 4 httpd 2.0.52-49.ent, mod_ssl 2.0.52-49.ent, httpd-manual 2.0.52-49.ent, httpd-suexec 2.0.52-49.ent Red Hat Enterprise Linux Desktop (v. 5 client) httpd 2.2.3-53.el5_7.3, mod_ssl 2.2.3-53.el5_7.3, httpd-manual 2.2.3-53.el5_7.3 Red Hat Enterprise Linux Desktop version 4 httpd 2.0.52-49.ent, mod_ssl 2.0.52-49.ent, httpd-manual 2.0.52-49.ent, httpd-suexec 2.0.52-49.ent Red Hat Enterprise Linux ES version 4 httpd 2.0.52-49.ent, mod_ssl 2.0.52-49.ent, httpd-manual 2.0.52-49.ent, httpd-suexec 2.0.52-49.ent
    fixed: vendor fix RHSA-2011:1392
  • Red Hat Enterprise Linux Server (v. 6) httpd 2.2.15-9.el6_1.3, mod_ssl 2.2.15-9.el6_1.3, httpd-tools 2.2.15-9.el6_1.3, httpd-manual 2.2.15-9.el6_1.3
    fixed: vendor fix RHSA-2011:1391
  • Red Hat Enterprise Linux WS version 4 httpd 2.0.52-49.ent, mod_ssl 2.0.52-49.ent, httpd-manual 2.0.52-49.ent, httpd-suexec 2.0.52-49.ent
    fixed: vendor fix RHSA-2011:1392
  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server httpd 2.2.17-15.4.ep5.el5, mod_ssl 2.2.17-15.4.ep5.el5, httpd-manual 2.2.17-15.4.ep5.el5 Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server httpd 2.2.17-15.4.ep5.el6, mod_ssl 2.2.17-15.4.ep5.el6, httpd-tools 2.2.17-15.4.ep5.el6, httpd-manual 2.2.17-15.4.ep5.el6
    fixed: vendor fix RHSA-2012:0542
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2012:0543
  • Red Hat RHEL Desktop Workstation (v. 5 client) httpd 2.2.3-53.el5_7.3, mod_ssl 2.2.3-53.el5_7.3, httpd-manual 2.2.3-53.el5_7.3
    fixed: vendor fix RHSA-2011:1392

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-17969)

Exploit prediction

90.73% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.