{"id":"CVE-2016-4864","aliases":["EUVD-2016-5844","GHSA-h4xp-827w-ffh7"],"status":"published","title":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a...","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","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":"2026-11-08","score":0.01802,"percentile":0.78657,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-134"],"published":"2017-05-12T18:00:00Z","modified":"2026-10-20T10:47:30Z","products":[{"vendor":"dena","product":"h2o"},{"vendor":"h2o","product":"h2o"},{"vendor":"kazuho oku","product":"h2o"}],"references":[{"url":"https://github.com/h2o/h2o/issues/1077","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://jvn.jp/en/jp/JVN94779084/index.html","tags":["third-party-advisory","x_refsource_JVN","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4864"},{"url":"https://github.com/advisories/GHSA-h4xp-827w-ffh7"}],"sources":{"cve":[{"id":"CVE-2016-4864","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","status":"published","published":"2017-05-12T18:00:00Z","modified":"2024-08-06T00:46:38.474Z","updated_at":"2026-11-02T14:33:34.815789Z"}],"euvd":[{"id":"EUVD-2016-5844","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","status":"published","published":"2017-05-12T18:00:00Z","modified":"2024-08-06T00:46:38Z","updated_at":"2026-11-03T02:22:44.916959Z"}],"ghsa":[{"id":"GHSA-h4xp-827w-ffh7","title":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a...","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","status":"published","published":"2022-05-14T01:31:08Z","modified":"2023-02-02T05:03:47Z","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-134"],"updated_at":"2026-11-02T14:51:42.915943Z"}],"nvd":[{"id":"CVE-2016-4864","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","status":"published","published":"2017-05-12T18:29:00.437Z","modified":"2026-06-17T00:48:21.337Z","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","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-134"],"updated_at":"2026-11-02T14:03:38.290327Z"}],"osv":[{"id":"CVE-2016-4864","description":"H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.","status":"published","published":"2017-05-12T18:29:00.437Z","modified":"2026-10-20T10:47:30.259064407Z","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":"2026-11-02T15:44:02.454775Z"}]}}