CVE-2014-0099: Apache Tomcat Improper Neutralization Of CRLF Sequences Vulnerability
MODERATECVE-2014-0099 is a MODERATE improper neutralization of crlf sequences vulnerability (CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves improper neutralization of crlf sequences in http headers in apache tomcat. Remediation is available by upgrading affected packages to version 6.0.40, 7.0.54, 8.0.6.
CVE-2014-0099 at a Glance
How to Fix CVE-2014-0099
To remediate this vulnerability, upgrade all affected Apache Tomcat dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat</artifactId>
<version>6.0.40</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat</artifactId>
<version>7.0.54</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat</artifactId>
<version>8.0.6</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-util</artifactId>
<version>6.0.40</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-util</artifactId>
<version>7.0.54</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-util</artifactId>
<version>8.0.6</version>
</dependency>
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.tomcat
How to Check if You Are Affected
To determine whether your Java application is affected by CVE-2014-0099, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.tomcat
Analyze the terminal output to locate any version of Apache Tomcat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.40), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.apache.tomcat command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting'), where the product receives data from an http agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes cr and lf characters before the data is included in outgoing http headers. In Apache Tomcat, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2014-0099 Affected Apache Tomcat Versions
6 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.apache.tomcat:tomcat
|
Maven |
< 6.0.40
|
6.0.40
|
|
org.apache.tomcat:tomcat
|
Maven |
≥ 7.0.0
< 7.0.54
|
7.0.54
|
|
org.apache.tomcat:tomcat
|
Maven |
≥ 8.0.0
< 8.0.6
|
8.0.6
|
|
org.apache.tomcat:tomcat-util
|
Maven |
< 6.0.40
|
6.0.40
|
|
org.apache.tomcat:tomcat-util
|
Maven |
≥ 7.0.0
< 7.0.54
|
7.0.54
|
|
org.apache.tomcat:tomcat-util
|
Maven |
≥ 8.0.0
< 8.0.6
|
8.0.6
|
References
Frequently Asked Questions
What is CVE-2014-0099?
Which Apache Tomcat versions are affected?
What version fixes CVE-2014-0099?
Is tomcat affected?
Is tomcat-util affected?
What CWE is associated with CVE-2014-0099?
How can I check Maven dependencies for CVE-2014-0099?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-xh5x-j8jf-pcpx",
"modified" : "2025-04-14T21:42:27Z",
"published" : "2022-05-14T01:10:18Z",
"aliases" : [ "CVE-2014-0099" ],
"summary" : "Improper Neutralization of CRLF Sequences in HTTP Headers in Apache Tomcat",
"details" : "Integer overflow in java/org/apache/tomcat/util/buf/Ascii.java in Apache Tomcat before 6.0.40, 7.x before 7.0.53, and 8.x before 8.0.4, when operated behind a reverse proxy, allows remote attackers to conduct HTTP request smuggling attacks via a crafted Content-Length HTTP header.",
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}