CVE-2014-0099

16

FAUCET Score

CVE-2014-0099 describes an integer overflow vulnerability in Apache Tomcat versions prior to 6.0.40, 7.0.53, and 8.0.4. This flaw, specifically in the Ascii.java component, allows remote attackers to perform HTTP request smuggling attacks when Tomcat is deployed behind a reverse proxy, by manipulating the Content-Length HTTP header. With a CVSS score of 4.3, it has a medium attack complexity and could lead to partial integrity impact, but no confidentiality or availability impact. Despite its high FAUCET Risk Score of 96/100 and an EPSS score indicating higher exploitability than 97% of CVEs, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 6.0.39CPE matchmatch criteria	cpe:2.3:a:apache:tomcat::::::::
		6CPE matchmatch criteria	cpe:2.3:a:apache:tomcat:6:::::::*
		6.0CPE matchmatch criteria	cpe:2.3:a:apache:tomcat:6.0:::::::*
		6.0.0CPE matchmatch criteria	cpe:2.3:a:apache:tomcat:6.0.0:::::::*
		6.0.0CPE matchmatch criteria	cpe:2.3:a:apache:tomcat:6.0.0:alpha::::::

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Exploitability Score

8.6

Impact Score

2.9

CvssVersion

2.0

Exploit Intelligence

EPSS Score

8.84%

Probability of exploitation in next 30 days

EPSS Percentile

94.7%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0884 is in the 94th percentile among its peer group of 19,956 CVEs.

Social Chatter

No social media mentions found for this CVE.

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 (30)

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcat-utilFixed in: 6.0.40

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcat-utilFixed in: 7.0.54

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcatFixed in: 6.0.40

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcat-utilFixed in: 8.0.6

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcatFixed in: 7.0.54

mavenpatch availablevia ghsa

Product: org.apache.tomcat:tomcatFixed in: 8.0.6

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Data Virtualization 6.0Fixed in: jbossweb

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Data Virtualization 6.1

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 6.2

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 6.2 for RHEL 5Fixed in: jbossweb-0:7.3.2-4.Final_redhat_3.1.ep6.el5

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 2 for RHEL 5Fixed in: tomcat6-0:6.0.37-20_patch_04.ep6.el5

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 2 for RHEL 5Fixed in: tomcat7-0:7.0.40-14_patch_03.ep6.el5

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 2 for RHEL 6Fixed in: tomcat6-0:6.0.37-29_patch_05.ep6.el6

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 2 for RHEL 6Fixed in: tomcat7-0:7.0.40-11_patch_03.ep6.el6

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Fuse Service Works 6.0Fixed in: jbossweb

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Operations Network 3.2

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Portal 6.2Fixed in: jbossweb

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Web Server 2.0Fixed in: tomcat6

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Web Server 2.0Fixed in: tomcat7

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 6.2 for RHEL 6Fixed in: jbossweb-0:7.3.2-4.Final_redhat_3.1.ep6.el6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 6Fixed in: tomcat6-0:6.0.24-72.el6_5

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: tomcat-0:7.0.42-6.el7_0

redhatpatch availablevia redhat_api

Product: Red Hat JBoss BPMS 6.0Fixed in: jbossweb

redhatpatch availablevia redhat_api

Product: Red Hat JBoss BRMS 6.0Fixed in: jbossweb

redhatpatch availablevia redhat_api

Product: Red Hat JBoss Data Grid 6.3Fixed in: jbossweb

redhatno patchvia redhat_api

Product: Red Hat JBoss Operations Network 3Fixed in: jbossweb

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 5Fixed in: tomcat5

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Application Platform 5Fixed in: jbossweb

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 1Fixed in: tomcat5

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 1Fixed in: tomcat6

Vendor Advisories (2)

mavenGHSA-xh5x-j8jf-pcpxmedium

Improper Neutralization of CRLF Sequences in HTTP Headers in Apache Tomcat

redhatCVE-2014-0099Moderate

Tomcat/JBossWeb: Request smuggling via malicious content length header

References

advisories.mageia.org / MGASA-2014-0268.html

linux.oracle.com / errata/ELSA-2014-0865.html

lists.fedoraproject.org / pipermail/package-announce/2015-February/150282.html

rhn.redhat.com / errata/RHSA-2015-0675.html

rhn.redhat.com / errata/RHSA-2015-0720.html

rhn.redhat.com / errata/RHSA-2015-0765.html

seclists.org / fulldisclosure/2014/Dec/23

seclists.org / fulldisclosure/2014/May/138

seclists.org / fulldisclosure/2014/May/140

secunia.com / advisories/59121

secunia.com / advisories/59678

secunia.com / advisories/59732

secunia.com / advisories/59835

secunia.com / advisories/59849

secunia.com / advisories/59873

secunia.com / advisories/60729

secunia.com / advisories/60793

h20564.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay

lists.apache.org / thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E

lists.apache.org / thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E

lists.apache.org / thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95%40%3Cdev.tomcat.apache.org%3E

lists.apache.org / thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E

lists.apache.org / thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c%40%3Cdev.tomcat.apache.org%3E

lists.apache.org / thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E

svn.apache.org / viewvc

svn.apache.org / viewvc

svn.apache.org / viewvc

tomcat.apache.org / security-6.html

Vendor Advisory

tomcat.apache.org / security-7.html

Vendor Advisory

tomcat.apache.org / security-8.html

Vendor Advisory

www-01.ibm.com / support/docview.wss

www-01.ibm.com / support/docview.wss

www-01.ibm.com / support/docview.wss

debian.org / security/2016/dsa-3447

debian.org / security/2016/dsa-3530

mandriva.com / security/advisories

mandriva.com / security/advisories

mandriva.com / security/advisories

oracle.com / technetwork/security-advisory/cpuoct2016-2881722.html

oracle.com / technetwork/topics/security/cpujul2014-1972956.html

securityfocus.com / archive/1/532218/100/0/threaded

securityfocus.com / archive/1/532221/100/0/threaded

securityfocus.com / archive/1/534161/100/0/threaded

securityfocus.com / bid/67668

securitytracker.com / id/1030302

vmware.com / security/advisories/VMSA-2014-0012.html