CVE-2020-11080

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.

• CWE-707
• CWE-400

• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.htmlMailing List, Third Party Advisory
• https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090Patch, Third Party Advisory
• https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394Patch, Third Party Advisory
• https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xrPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00011.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/
• https://www.debian.org/security/2020/dsa-4696Third Party Advisory
• https://www.oracle.com//security-alerts/cpujul2021.htmlNot Applicable, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.htmlMailing List, Third Party Advisory
• https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090Patch, Third Party Advisory
• https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394Patch, Third Party Advisory
• https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xrPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00011.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/
• https://www.debian.org/security/2020/dsa-4696Third Party Advisory
• https://www.oracle.com//security-alerts/cpujul2021.htmlNot Applicable, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory

Published

Jun 3, 2020

Last Modified

Jun 17, 2026

Status

Modified

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