{"id":"CVE-2016-6817","aliases":["EUVD-2022-2759","GHSA-698c-2x4j-g9gq"],"status":"published","title":"Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.0719,"percentile":0.94339,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119","CWE-835"],"published":"2017-08-10T22:00:00Z","modified":"2026-10-24T10:30:21Z","fixes":[{"ecosystem":"Maven","package":"org.apache.tomcat:tomcat","fixed_in":["9.0.0.M12","8.5.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0.M1"},{"last_affected":"9.0.0.M11"},{"fixed":"9.0.0.M12"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.5.0"},{"fixed":"8.5.8"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0.M1"},{"fixed":"9.0.0.M12"}]}],"versions":["9.0.0.M1","9.0.0.M10","9.0.0.M11","9.0.0.M3","9.0.0.M4","9.0.0.M6","9.0.0.M8","9.0.0.M9"]},{"source":"osv","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.5.0"},{"fixed":"8.5.8"}]}],"versions":["8.5.0","8.5.2","8.5.3","8.5.4","8.5.5","8.5.6"]}],"products":[{"vendor":"apache","product":"tomcat"},{"vendor":"apache software foundation","product":"apache tomcat"}],"references":[{"url":"http://www.securitytracker.com/id/1037330","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://lists.apache.org/thread.html/a9f24571460af003071475b75f18cad81ebcc36fa7c876965a75e32a%40%3Cannounce.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://security.netapp.com/advisory/ntap-20180607-0001/","tags":["x_refsource_CONFIRM","x_transferred","advisory"]},{"url":"http://www.securityfocus.com/bid/94462","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-6817","tags":["advisory"]},{"url":"https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551@%3Cdev.tomcat.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3@%3Cdev.tomcat.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a@%3Cdev.tomcat.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/a9f24571460af003071475b75f18cad81ebcc36fa7c876965a75e32a@%3Cannounce.tomcat.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc@%3Cdev.tomcat.apache.org%3E","tags":["web"]},{"url":"https://web.archive.org/web/20180115024458/http://www.securitytracker.com/id/1037330","tags":["web"]},{"url":"https://web.archive.org/web/20200227174145/http://www.securityfocus.com/bid/94462","tags":["web"]},{"url":"https://github.com/apache/tomcat/commit/079372fc7bac8e2e378942715c9ce26a4a72c07a","tags":["web"]},{"url":"https://github.com/apache/tomcat/commit/85c63227edabbfb4f2f500fc557480a190135d21","tags":["web"]},{"url":"https://security.netapp.com/advisory/ntap-20180607-0001","tags":["web"]},{"url":"https://github.com/advisories/GHSA-698c-2x4j-g9gq"},{"url":"https://github.com/apache/tomcat","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2016-6817","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2017-08-10T22:00:00Z","modified":"2024-10-15T19:01:10.556Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:33:34.815789Z"}],"euvd":[{"id":"EUVD-2022-2759","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2017-08-10T22:00:00Z","modified":"2024-10-15T19:01:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:27:36.237079Z"}],"ghsa":[{"id":"GHSA-698c-2x4j-g9gq","title":"Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2022-05-14T01:10:16Z","modified":"2024-10-15T23:33:07Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119","CWE-835"],"updated_at":"2026-11-02T14:38:11.479492Z"}],"nvd":[{"id":"CVE-2016-6817","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2017-08-10T22:29:00.233Z","modified":"2026-06-17T00:51:49.92Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-119","CWE-835"],"updated_at":"2026-11-02T14:03:39.176887Z"}],"osv":[{"id":"CVE-2016-6817","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2017-08-10T22:29:00.233Z","modified":"2026-10-24T10:30:21.681142614Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:02.776224Z"},{"id":"GHSA-698c-2x4j-g9gq","title":"Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat","description":"The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.","status":"published","published":"2022-05-14T01:10:16Z","modified":"2024-10-15T23:41:19.563049Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119","CWE-835"],"updated_at":"2026-11-02T15:46:39.618611Z"}]}}