CVE-2011-3348

The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with...

4.3 MediumFix available

CVE-2011-3348 is a medium vulnerability (CVSS 4.3) in Apache Http Server, published September 19, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 22.4%, the 97th percentile. Fixed in apache2 2.2.21-1.

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.

Exploit likelihood

22.4%Up 15.0 points since Feb 4, 2022

What each source reports

NVD Score used 4.3

Record: CVE-2011-3348
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-400
Updated: 2026-11-02

CVE List No score

Record: CVE-2011-3348
Updated: 2026-11-02

EUVDEUVD-2011-3312 No score

Record: EUVD-2011-3312
Updated: 2026-11-03

GitHub AdvisoriesGHSA-vqqq-3xjq-cg84 No score

The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with...

Record: GHSA-vqqq-3xjq-cg84
Weakness: CWE-400
Updated: 2026-11-02

OSVBELL-CVE-2011-3348 4.3

CVE-2011-3348 does not affect BellSoft software

Record: BELL-CVE-2011-3348
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

OSV No score

Record: CVE-2011-3348
Updated: 2026-11-02

OSVDEBIAN-CVE-2011-3348 No score

Record: DEBIAN-CVE-2011-3348
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`apache2` Debian:12	before 2.2.21-1	2.2.21-1
`apache2` Debian:13	before 2.2.21-1	2.2.21-1
`apache2` Debian:14	before 2.2.21-1	2.2.21-1
`httpd` Red Hat:enterprise_linux:6::server	before 0:2.2.15-9.el6_1.3	0:2.2.15-9.el6_1.3
`httpd-debuginfo` Red Hat:enterprise_linux:6::server	before 0:2.2.15-9.el6_1.3	0:2.2.15-9.el6_1.3
`httpd-devel` Red Hat:enterprise_linux:6::server	before 0:2.2.15-9.el6_1.3	0:2.2.15-9.el6_1.3
`httpd-manual` Red Hat:enterprise_linux:6::server	before 0:2.2.15-9.el6_1.3	0:2.2.15-9.el6_1.3
`httpd-tools` Red Hat:enterprise_linux:6::server	before 0:2.2.15-9.el6_1.3	0:2.2.15-9.el6_1.3
`mod_ssl` Red Hat:enterprise_linux:6::server	before 1:2.2.15-9.el6_1.3	1:2.2.15-9.el6_1.3
`httpd` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.17-15.4.ep5.el5	0:2.2.17-15.4.ep5.el5

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Affected packages
Package	Affected	Fixed
`httpd-devel` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.17-15.4.ep5.el5	0:2.2.17-15.4.ep5.el5
`httpd-manual` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.17-15.4.ep5.el5	0:2.2.17-15.4.ep5.el5
`mod_ssl` Red Hat:jboss_enterprise_web_server:1::el5	before 1:2.2.17-15.4.ep5.el5	1:2.2.17-15.4.ep5.el5
`httpd` Red Hat:jboss_enterprise_web_server:1::el6	before 0:2.2.17-15.4.ep5.el6	0:2.2.17-15.4.ep5.el6
`httpd-devel` Red Hat:jboss_enterprise_web_server:1::el6	before 0:2.2.17-15.4.ep5.el6	0:2.2.17-15.4.ep5.el6
`httpd-manual` Red Hat:jboss_enterprise_web_server:1::el6	before 0:2.2.17-15.4.ep5.el6	0:2.2.17-15.4.ep5.el6
`httpd-tools` Red Hat:jboss_enterprise_web_server:1::el6	before 0:2.2.17-15.4.ep5.el6	0:2.2.17-15.4.ep5.el6
`mod_ssl` Red Hat:jboss_enterprise_web_server:1::el6	before 1:2.2.17-15.4.ep5.el6	1:2.2.17-15.4.ep5.el6

History

History
When	Changed	Sources
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV

References

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