CVE-2011-3348

Name: CVE-2011-3348
Creator: NVD / NIST
Published: 2011-09-20T05:55:02.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 22.38%

Last modified Jun 16, 2026

CVE-2011-3348 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 22.38% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

22.38%

97.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Apache	Http Server	>= 2.2.12, <= 2.2.20
Redhat	Jboss Enterprise Web Server	1.0.0

References

http://community.jboss.org/message/625307Exploit, Third Party Advisory
http://httpd.apache.org/security/vulnerabilities_22.html#2.2.21Vendor Advisory
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.htmlBroken Link, Mailing List
http://marc.info/?l=bugtraq&m=131731002122529&w=2Issue Tracking, Mailing List, Third Party Advisory
http://marc.info/?l=bugtraq&m=132033751509019&w=2Issue Tracking, Mailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2012-0542.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2012-0543.htmlThird Party Advisory
http://secunia.com/advisories/46013Not Applicable, Vendor Advisory
http://support.apple.com/kb/HT5130Third Party Advisory
http://www.apache.org/dist/httpd/Announcement2.2.htmlBroken Link
http://www.mandriva.com/security/advisories?name=MDVSA-2011:168Broken Link
http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-1391.htmlThird Party Advisory
http://www.securityfocus.com/bid/49616Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1026054Broken Link, Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/69804Third Party Advisory, VDB Entry
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r688df6f16f141e966a0a47f817e559312b3da27886f59116a94b273d%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re2e23465bbdb17ffe109d21b4f192e6b58221cd7aa8797d530b4cd75%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14941Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18154Third Party Advisory
http://community.jboss.org/message/625307Exploit, Third Party Advisory
http://httpd.apache.org/security/vulnerabilities_22.html#2.2.21Vendor Advisory
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.htmlBroken Link, Mailing List
http://marc.info/?l=bugtraq&m=131731002122529&w=2Issue Tracking, Mailing List, Third Party Advisory
http://marc.info/?l=bugtraq&m=132033751509019&w=2Issue Tracking, Mailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2012-0542.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2012-0543.htmlThird Party Advisory
http://secunia.com/advisories/46013Not Applicable, Vendor Advisory
http://support.apple.com/kb/HT5130Third Party Advisory
http://www.apache.org/dist/httpd/Announcement2.2.htmlBroken Link
http://www.mandriva.com/security/advisories?name=MDVSA-2011:168Broken Link
http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-1391.htmlThird Party Advisory
http://www.securityfocus.com/bid/49616Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1026054Broken Link, Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/69804Third Party Advisory, VDB Entry
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r688df6f16f141e966a0a47f817e559312b3da27886f59116a94b273d%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re2e23465bbdb17ffe109d21b4f192e6b58221cd7aa8797d530b4cd75%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14941Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18154Third Party Advisory

Timeline

Published: Sep 20, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-3348?

How severe is CVE-2011-3348?

Severity scoring for CVE-2011-3348 is pending analysis. The EPSS model estimates a 22.38% probability of exploitation in the next 30 days.

How do I fix CVE-2011-3348?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-3348?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST