CVE-2020-11080: Debian Linux

High severity, CVSS 7.5. EPSS: 5.3% chance of exploitation in the next 30 days.

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., > 32), then drop the connection.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 33 only
• NGHTTP2 NGHTTP2: before 1.41.0 (fixed in 1.41.0)
• Node.js Node.js: from 10.0.0, up to and including 10.12.0; from 10.13.0, before 10.21.0 (fixed in 10.21.0); from 12.0.0, up to and including 12.12.0; from 12.13.0, before 12.18.0 (fixed in 12.18.0); from 14.0.0, up to and including 14.4.0
• Opensuse Leap: version 15.1 only
• Oracle Banking Extensibility Workbench: version 14.3.0 only; version 14.4.0 only
• Oracle Blockchain Platform: before 21.1.2 (fixed in 21.1.2)
• Oracle Enterprise Communications Broker: version 3.1.0 only; version 3.2.0 only
• Oracle Graalvm: version 19.3.2 only; version 20.1.0 only
• Oracle MySQL: from 7.3.0, up to and including 7.3.30; from 7.4.0, up to and including 7.4.29; from 7.5.0, up to and including 7.5.19; from 7.6.0, up to and including 7.6.15; from 8.0.0, up to and including 8.0.21

Published 2020-06-03. Last modified 2026-06-17.