{"cve":"CVE-2016-6816","nvd":{"published":"2017-03-20T18:59:00.173","modified":"2026-06-17T00:51:49.607","status":"Modified","description":"The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack and/or obtain sensitive information from requests other then their own.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","score":7.1},"cwes":["CWE-20"],"references":["http://rhn.redhat.com/errata/RHSA-2017-0244.html","http://rhn.redhat.com/errata/RHSA-2017-0245.html","http://rhn.redhat.com/errata/RHSA-2017-0246.html","http://rhn.redhat.com/errata/RHSA-2017-0247.html","http://rhn.redhat.com/errata/RHSA-2017-0250.html"],"products":["apache:tomcat"],"source":"nvd","synced_at":"2026-10-19T20:41:54.846948762+00:00"},"epss":{"cve":"CVE-2016-6816","score":0.39633,"percentile":0.98616,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jc7p-5r39-9477","url":"https://osv.dev/vulnerability/GHSA-jc7p-5r39-9477","summary":"Improper Input Validation in Apache Tomcat","modified":"2024-03-11T05:31:18.965326Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=9.0.0.M1 <9.0.0.M12"],"fixed":["9.0.0.M12"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.5.0 <8.5.8"],"fixed":["8.5.8"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.0.0RC1 <8.0.39"],"fixed":["8.0.39"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=7.0.0 <7.0.73"],"fixed":["7.0.73"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=6.0.0 <6.0.48"],"fixed":["6.0.48"]}]}],"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."]}