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CVE-2011-3348

27
FAUCET Score

CVE-2011-3348 describes a denial-of-service vulnerability in the Apache HTTP Server, specifically affecting the mod_proxy_ajp module when configured with mod_proxy_balancer. This flaw allows remote attackers to temporarily disrupt backend servers via malformed HTTP requests, impacting products like Apache HTTP Server and Red Hat Enterprise Linux. The vulnerability has a CVSS score of 4.3 (medium severity), indicating a network-based attack with medium complexity leading to partial availability impact. Despite its age, there is no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not a high-priority threat.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.2.12, <= 2.2.20CPE matchmatch criteria
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_enterprise_web_server:1.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
22.38%
Probability of exploitation in next 30 days
EPSS Percentile
97.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2238 is in the 98th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: httpd-0:2.2.15-9.el6_1.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 5Fixed in: httpd-0:2.2.17-15.4.ep5.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1 for RHEL 6Fixed in: httpd-0:2.2.17-15.4.ep5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 1.0
View patch

Vendor Advisories (1)

redhatCVE-2011-3348Moderate

httpd: mod_proxy_ajp remote temporary DoS

Sep 14, 2011

References

community.jboss.org / message/625307
ExploitThird Party Advisory
httpd.apache.org / security/vulnerabilities_22.html
Vendor Advisory
lists.apple.com / archives/security-announce/2012/Feb/msg00000.html
Broken LinkMailing List
marc.info
Issue TrackingMailing ListThird Party Advisory
marc.info
Issue TrackingMailing ListThird Party Advisory
rhn.redhat.com / errata/RHSA-2012-0542.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2012-0543.html
Third Party Advisory
secunia.com / advisories/46013
Not ApplicableVendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/69804
Third Party AdvisoryVDB Entry
lists.apache.org / thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r688df6f16f141e966a0a47f817e559312b3da27886f59116a94b273d%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/re2e23465bbdb17ffe109d21b4f192e6b58221cd7aa8797d530b4cd75%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
lists.apache.org / thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14941
Third Party Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18154
Third Party Advisory
support.apple.com / kb/HT5130
Third Party Advisory
apache.org / dist/httpd/Announcement2.2.html
Broken Link
mandriva.com / security/advisories
Broken Link
oracle.com / technetwork/topics/security/cpujuly2013-1899826.html
Third Party Advisory
redhat.com / support/errata/RHSA-2011-1391.html
Third Party Advisory
securityfocus.com / bid/49616
Third Party AdvisoryVDB Entry
securitytracker.com / id
Broken LinkThird Party AdvisoryVDB Entry