{"cve":"CVE-2013-4286","nvd":{"published":"2014-02-26T14:55:08.160","modified":"2026-10-09T20:17:07.187","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://advisories.mageia.org/MGASA-2014-0148.html","http://marc.info/?l=bugtraq&m=141390017113542&w=2","http://marc.info/?l=bugtraq&m=144498216801440&w=2","http://rhn.redhat.com/errata/RHSA-2014-0343.html","http://rhn.redhat.com/errata/RHSA-2014-0344.html"],"products":["apache:tomcat"],"source":"nvd","synced_at":"2026-10-19T20:32:06.812358378+00:00"},"epss":{"cve":"CVE-2013-4286","score":0.16206,"percentile":0.96916,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-j448-j653-r3vj","url":"https://osv.dev/vulnerability/GHSA-j448-j653-r3vj","summary":"Apache Tomcat is vulnerable to HTTP request-smuggling","modified":"2024-12-07T05:33:59.467532Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":["<6.0.39"],"fixed":["6.0.39"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=7.0.0 <7.0.47"],"fixed":["7.0.47"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=8.0.0-RC1 <8.0.0-RC3"],"fixed":["8.0.0-RC3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}