{"id":"UBUNTU-CVE-2020-11080","details":"In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., \u003e 32), then drop the connection.","modified":"2026-04-22T13:58:30.343636Z","published":"2020-06-03T23:15:00Z","related":["USN-6142-1"],"upstream":["CVE-2020-11080"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-11080"},{"type":"REPORT","url":"https://nodejs.org/en/blog/vulnerability/june-2020-security-releases/#http-2-large-settings-frame-dos-low-cve-2020-11080"},{"type":"REPORT","url":"https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090"},{"type":"REPORT","url":"https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394"},{"type":"REPORT","url":"https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6142-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-11080"}],"affected":[{"package":{"name":"nghttp2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nghttp2@1.7.1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1-1ubuntu0.1~esm1"}]}],"versions":["0.6.7-1","1.3.4-2","1.4.0-1","1.4.0-2","1.5.0-2","1.6.0-1","1.7.0-1","1.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnghttp2-14","binary_version":"1.7.1-1ubuntu0.1~esm1"},{"binary_name":"nghttp2","binary_version":"1.7.1-1ubuntu0.1~esm1"},{"binary_name":"nghttp2-client","binary_version":"1.7.1-1ubuntu0.1~esm1"},{"binary_name":"nghttp2-proxy","binary_version":"1.7.1-1ubuntu0.1~esm1"},{"binary_name":"nghttp2-server","binary_version":"1.7.1-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11080.json"}},{"package":{"name":"nghttp2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/nghttp2@1.30.0-1ubuntu1+esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.30.0-1ubuntu1+esm1"}]}],"versions":["1.25.0-1","1.27.0-1","1.28.0-1","1.29.0-1","1.29.0-1build1","1.30.0-1","1.30.0-1ubuntu1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"1.30.0-1ubuntu1+esm1","binary_name":"libnghttp2-14"},{"binary_name":"nghttp2","binary_version":"1.30.0-1ubuntu1+esm1"},{"binary_name":"nghttp2-client","binary_version":"1.30.0-1ubuntu1+esm1"},{"binary_name":"nghttp2-proxy","binary_version":"1.30.0-1ubuntu1+esm1"},{"binary_name":"nghttp2-server","binary_version":"1.30.0-1ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11080.json"}},{"package":{"name":"nghttp2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/nghttp2@1.40.0-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.40.0-1ubuntu0.1"}]}],"versions":["1.39.2-1","1.40.0-1","1.40.0-1build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libnghttp2-14","binary_version":"1.40.0-1ubuntu0.1"},{"binary_name":"nghttp2","binary_version":"1.40.0-1ubuntu0.1"},{"binary_name":"nghttp2-client","binary_version":"1.40.0-1ubuntu0.1"},{"binary_name":"nghttp2-proxy","binary_version":"1.40.0-1ubuntu0.1"},{"binary_name":"nghttp2-server","binary_version":"1.40.0-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11080.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}