# CVE-2020-11080: Denial of service in nghttp2 CVE-2020-11080 is fixed in 16 products on 2 platforms, first by libnghttp2-14 1.30.0-1ubuntu1+esm1, released June 3, 2020. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2020-11080 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0532 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 3, 2020 - Weakness: CWE-707: Improper Enforcement of Message or Data Structure - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-11080 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Node.js 10 | 10.23.2 | [Node.js 10 10.23.2](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.10-10.23.2.md) | Jan 26, 2021 | | Windows apps | Node.js 14 | 14.5.0 | [Node.js 14 14.5.0](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.14-14.5.0.md) | Jun 30, 2020 | | Linux | libnghttp2 RHEL 8 | 0:1.33.0-3.el8_2.1 | [RHSA-2020:2755](https://patchblox.com/security/data/fix/linux/rhsa-2020-2755.md) | Jun 25, 2020 | | Linux | libnghttp2 ol 8 | 0:1.33.0-3.el8_2.1 | [ELSA-2020-2755](https://patchblox.com/security/data/fix/linux/elsa-2020-2755.md) | Jul 6, 2020 | | Linux | libnghttp2-14 Ubuntu 18.04.6 LTS (bionic) | 1.30.0-1ubuntu1+esm1 | [libnghttp2-14 1.30.0-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnghttp2-14-1.30.0-1ubuntu1-esm1.md) | Jun 3, 2020 | | Linux | libnghttp2-14 Ubuntu 20.04 LTS (focal) | 1.40.0-1ubuntu0.1 | [libnghttp2-14 1.40.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnghttp2-14-1.40.0-1ubuntu0.1.md) | Jun 3, 2020 | | Linux | libnghttp2-devel RHEL 8 | 0:1.33.0-3.el8_2.1 | [RHSA-2020:2755](https://patchblox.com/security/data/fix/linux/rhsa-2020-2755.md) | Jun 25, 2020 | | Linux | libnghttp2-devel ol 8 | 0:1.33.0-3.el8_2.1 | [ELSA-2020-2755](https://patchblox.com/security/data/fix/linux/elsa-2020-2755.md) | Jul 6, 2020 | | Linux | nghttp2 RHEL 8 | 0:1.33.0-3.el8_2.1 | [RHSA-2020:2755](https://patchblox.com/security/data/fix/linux/rhsa-2020-2755.md) | Jun 25, 2020 | | Linux | nghttp2 Ubuntu 18.04.6 LTS (bionic) | 1.30.0-1ubuntu1+esm1 | [nghttp2 1.30.0-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nghttp2-1.30.0-1ubuntu1-esm1.md) | Jun 3, 2020 | | Linux | nghttp2 Ubuntu 20.04 LTS (focal) | 1.40.0-1ubuntu0.1 | [nghttp2 1.40.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nghttp2-1.40.0-1ubuntu0.1.md) | Jun 3, 2020 | | Linux | nghttp2 ol 8 | 0:1.33.0-3.el8_2.1 | [ELSA-2020-2755](https://patchblox.com/security/data/fix/linux/elsa-2020-2755.md) | Jul 6, 2020 | | Linux | nghttp2-client Ubuntu 18.04.6 LTS (bionic) | 1.30.0-1ubuntu1+esm1 | [nghttp2-client 1.30.0-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nghttp2-client-1.30.0-1ubuntu1-esm1.md) | Jun 3, 2020 | | Linux | nghttp2-client Ubuntu 20.04 LTS (focal) | 1.40.0-1ubuntu0.1 | [nghttp2-client 1.40.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nghttp2-client-1.40.0-1ubuntu0.1.md) | Jun 3, 2020 | | Linux | nghttp2-proxy Ubuntu 18.04.6 LTS (bionic) | 1.30.0-1ubuntu1+esm1 | [nghttp2-proxy 1.30.0-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nghttp2-proxy-1.30.0-1ubuntu1-esm1.md) | Jun 3, 2020 | | Linux | nghttp2-proxy Ubuntu 20.04 LTS (focal) | 1.40.0-1ubuntu0.1 | [nghttp2-proxy 1.40.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nghttp2-proxy-1.40.0-1ubuntu0.1.md) | Jun 3, 2020 | | Linux | nghttp2-server Ubuntu 18.04.6 LTS (bionic) | 1.30.0-1ubuntu1+esm1 | [nghttp2-server 1.30.0-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nghttp2-server-1.30.0-1ubuntu1-esm1.md) | Jun 3, 2020 | | Linux | nghttp2-server Ubuntu 20.04 LTS (focal) | 1.40.0-1ubuntu0.1 | [nghttp2-server 1.40.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nghttp2-server-1.40.0-1ubuntu0.1.md) | Jun 3, 2020 | | Linux | nodejs RHEL 8 | 1:12.18.2-1.module+el8.2.0+7233+61d664c1 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs ol 8 | 1:10.21.0-3.module+el8.2.0+7635+4ebb0540 | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | nodejs-devel RHEL 8 | 1:12.18.2-1.module+el8.2.0+7233+61d664c1 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs-devel ol 8 | 1:10.21.0-3.module+el8.2.0+7635+4ebb0540 | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | nodejs-docs RHEL 8 | 1:12.18.2-1.module+el8.2.0+7233+61d664c1 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs-docs ol 8 | 1:10.21.0-3.module+el8.2.0+7635+4ebb0540 | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | nodejs-full-i18n RHEL 8 | 1:12.18.2-1.module+el8.2.0+7233+61d664c1 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs-full-i18n ol 8 | 1:10.21.0-3.module+el8.2.0+7635+4ebb0540 | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | nodejs-nodemon RHEL 8 | 0:1.18.3-1.module+el8.1.0+3369+37ae6a45 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs-nodemon ol 8 | 0:1.18.3-1.module+el8.1.0+5392+4d6b561f | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | nodejs-packaging RHEL 8 | 0:17-3.module+el8.1.0+3369+37ae6a45 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | nodejs-packaging ol 8 | 0:17-3.module+el8.1.0+5392+4d6b561f | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | | Linux | npm RHEL 8 | 1:6.14.5-1.12.18.2.1.module+el8.2.0+7233+61d664c1 | [RHSA-2020:2852](https://patchblox.com/security/data/fix/linux/rhsa-2020-2852.md) | Jul 7, 2020 | | Linux | npm ol 8 | 1:6.14.4-1.10.21.0.3.module+el8.2.0+7635+4ebb0540 | [ELSA-2020-2848](https://patchblox.com/security/data/fix/linux/elsa-2020-2848.md) | Jul 14, 2020 | --- Data as of 2026-11-08T00:53:09Z UTC. 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