{"id":"CVE-2016-6816","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-6816","generatedAt":"2026-10-28T21:54:25.008Z","title":"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.","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.","published":"2017-03-20T18:59:00.000Z","lastModified":"2026-06-17T00:51:50.000Z","status":"Modified","sourceIdentifier":"security@apache.org","cvss":{"version":"3.0","score":7.1,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L"},"cwe":["CWE-20"],"affected":["apache/tomcat"],"epss":{"score":0.39633,"percentile":0.98609,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.47416,"percentile":0.98823},{"date":"2026-09-22","score":0.39633,"percentile":0.9855}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2017-04-04","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":41783,"kind":"exploit","title":"Apache Tomcat 6/7/8/9 - Information Disclosure","url":"https://www.exploit-db.com/exploits/41783","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/remote/41783.txt","file":"exploits/multiple/remote/41783.txt","published":"2017-04-04","added":"2017-04-03","updated":"2017-04-03","author":"justpentest","type":"remote","platform":"multiple","port":null,"verified":false,"codes":["CVE-2016-6816"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 39.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-21T00:00:00.000Z","detail":{"to":0.47416,"from":0.39633,"percentile":0.98823},"summary":"EPSS moved from 39.6% to 47.4% probability of exploitation in the next thirty days."}],"references":[{"url":"http://rhn.redhat.com/errata/RHSA-2017-0244.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0245.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0246.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0247.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0250.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0457.html","source":"security@apache.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2017-0527.html","source":"security@apache.org"},{"url":"http://www.debian.org/security/2016/dsa-3738","source":"security@apache.org"},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html","source":"security@apache.org"},{"url":"http://www.securityfocus.com/bid/94461","tags":["Third Party Advisory","VDB 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BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}