Skip to content
Fencer Intel
medium 4.3

CVE-2011-3348 json

The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows remot…

published 2011-09-19 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-3312

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
22.4%
EPSS 22.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows remote attackers to cause a denial of service (temporary "error state" in the backend server) via a malformed HTTP request.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.2.21-1

debian advisories DEBIAN-CVE-2011-3348

  • 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 6 2.2.15-9.el6_1.3

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

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-2011-3348 updated cvss 5.0

httpd: mod_proxy_ajp remote temporary DoS

  • 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 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 Enterprise Linux 4 httpd Red Hat Enterprise Linux 5 httpd
    not affected: vulnerable code not present

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

Exploit prediction

22.38% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • community.jboss.org http://community.jboss.org/message/625307 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
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.