CVE•Published 2014-02-26•Modified 2026-10-09•1 article on news•6 live references•NVD data

CVE-2013-4286Apache · Tomcat

Vulnerability data via NVD (ingested)

CVSS v3.1

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EPSS percentile

Exploit Prediction Scoring System · top 3% of all CVEs

Weaknesses (CWE)

CWE-20Improper Input Validation

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.

Timeline

Published 2014-02-26

Modified 2026-10-09

External references

NVD MITRE GitHub PoC Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag134 hosts

vuln:CVE-2013-4286

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product + version

product:"Apache Tomcat" version:"7.0.0"

Version-pinned fingerprint from NVD's first vulnerable CPE.

Shodan · banner/body mention

http.html:"Tomcat"

HTTP body or banner mentions "Tomcat" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2013-4286