What is CVE-2013-4286?

CVE-2013-4286 is a vulnerability in Apache Tomcat, classified under Improper Input Validation. Published 2014-02-26.

Is CVE-2013-4286 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Apache Tomcat

CVE-2013-4286

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2014-02-26 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.8 (Medium). Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.168 (97.0th percentile), scored 2026-10-01.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.168 · newest: 0.168 · change: 0.000

Affected products

Apache Tomcat — versions 7.0.0, 7.0.1, 7.0.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

rhn.redhat.com/errata/RHSA-2014-0345.html (vendor-advisory)
secunia.com/advisories/59733 (third-party-advisory)
www.vmware.com/security/advisories/VMSA-2014-0012.html
rhn.redhat.com/errata/RHSA-2014-0686.html (vendor-advisory)
www.mandriva.com/security/advisories (vendor-advisory)
secunia.com/advisories/59724 (third-party-advisory)
www.debian.org/security/2016/dsa-3530 (vendor-advisory)
tomcat.apache.org/security-7.html (Vendor Advisory)
secunia.com/advisories/57675 (third-party-advisory)
www.securityfocus.com/archive/1/534161/100/0/threaded (mailing-list)

Frequently asked questions

What is CVE-2013-4286?: CVE-2013-4286 is a vulnerability in Apache Tomcat, classified under Improper Input Validation. Published 2014-02-26.
Is CVE-2013-4286 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.