How severe is CVE-2013-4286?

No CVSS score has been assigned to CVE-2013-4286 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-4286?

CVE-2013-4286 affects the following packages: org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven). Ecosystems affected: Maven.

How do I fix CVE-2013-4286?

Update org.apache.tomcat:tomcat to 6.0.39 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4286 is resolved across your whole dependency graph.

How do I detect CVE-2013-4286 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2013-4286 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2013-4286 actively exploited in the wild?

No public exploit code has been indexed for CVE-2013-4286 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2013-4286?

CVE-2013-4286 has an EPSS (Exploit Prediction Scoring System) score of 16.2%, placing it in the 97th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

What type of vulnerability is CVE-2013-4286?

CVE-2013-4286 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2013-4286 published, and has it been updated?

CVE-2013-4286 was published on May 14, 2022 and was last updated on December 7, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

CVE-2013-4286 — tomcat

Fix: apache/tomcat@41b90b6

CVE-2013-4286 is a Improper Input Validation vulnerability in org.apache.tomcat:tomcat. EPSS puts its 30-day exploitation probability at 16.2% (97th percentile). A fix is available for org.apache.tomcat:tomcat — see the affected versions and patch details below.

Apache Tomcat is vulnerable to HTTP request-smuggling

Published

May 14, 2022

Updated

Dec 7, 2024

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2013-4286.

EPSS Exploitation Probability

via FIRST.org ↗

16.2%probability of exploitation in next 30 days

Moderate Risk0.00%

Lower risk than most CVEs97th percentile — riskier than 97% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

3 pkgs affected

☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Apache Tomcat before 6.0.39, 7.x before 7.0.47, and 8.x before 8.0.0-RC3, when an HTTP connector or AJP connector is used, does not properly handle certain inconsistent HTTP request headers, which allows remote attackers to trigger incorrect identification of a request's length and conduct request-smuggling attacks via (1) multiple Content-Length headers or (2) a Content-Length header and a "Transfer-Encoding: chunked" header. NOTE: this vulnerability exists because of an incomplete fix for CVE-2005-2090.

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.tomcat:tomcat`	all versions	6.0.39`org.apache.tomcat:tomcat:6.0.39`
☕Maven	`org.apache.tomcat:tomcat`	≥ 7.0.0&&< 7.0.47	7.0.47`org.apache.tomcat:tomcat:7.0.47`
☕Maven	`org.apache.tomcat:tomcat`	≥ 8.0.0-RC1&&< 8.0.0-RC3	8.0.0-RC3`org.apache.tomcat:tomcat:8.0.0-RC3`

Affected Products

1 product · 183 configurations

Application

tomcatapache

≤ 6.0.37

172 versions

1.1.33.03.13.1.13.23.2.13.2.23.2.33.2.43.33.3.13.3.1a

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tomcat:tomcat to 6.0.39 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4286 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Red Hat Enterprise Linux 6	`tomcat6-0:6.0.24-64.el6_5`	RHSA-2014:0429
Red Hat Enterprise Linux 7	`tomcat-0:7.0.42-5.el7_0`	RHSA-2014:0686
Red Hat JBoss BPMS 6.0	`jbossweb`	RHSA-2014:0373
Red Hat JBoss Data Grid 6.2	`jbossweb`	RHSA-2014:0374
Red Hat JBoss Data Virtualization 6.0	`jbossweb`	RHSA-2014:0458
Red Hat JBoss Enterprise Application Platform 6.2	`jbossweb`	RHSA-2014:0345
Red Hat JBoss Enterprise Application Platform 6.2 for RHEL 5	`apache-cxf-0:2.7.10-1.redhat_1.1.ep6.el5`	RHSA-2014:0343
Red Hat JBoss Enterprise Application Platform 6.2 for RHEL 6	`apache-cxf-0:2.7.10-1.redhat_1.1.ep6.el6`	RHSA-2014:0344

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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