# CVE-2019-9515: python3-twisted: Some HTTP/2 implementations are vulnerable to a settings flood, potentiallyleading to a denial of service CVE-2019-9515 is fixed in 19 products on 1 platform, first by libnetty-java 1:4.1.7-4ubuntu0.1+esm1, released August 12, 2019. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2019-9515 - Priority: High - CVSS: 7.5 (Medium) - EPSS: 0.8729 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 12, 2019 ## Description Some HTTP/2 implementations are vulnerable to a settings flood, potentiallyleading to a denial of service. The attacker sends a stream of SETTINGSframes to the peer. Since the RFC requires that the peer reply with oneacknowledgement per SETTINGS frame, an empty SETTINGS frame is almostequivalent in behavior to a ping. Depending on how efficiently this data isqueued, this can consume excess CPU, memory, or both. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libnetty-java Ubuntu 18.04.6 LTS (bionic) | 1:4.1.7-4ubuntu0.1+esm1 | [libnetty-java 1:4.1.7-4ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnetty-java-1-4.1.7-4ubuntu0.1-esm1.md) | Aug 12, 2019 | | Linux | nodejs RHEL 8 | 1:10.16.3-2.module+el8.0.0+4214+49953fda | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs ol 8 | 1:10.14.1-1.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-devel RHEL 8 | 1:10.16.3-2.module+el8.0.0+4214+49953fda | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-devel ol 8 | 1:10.14.1-1.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-docs RHEL 8 | 1:10.16.3-2.module+el8.0.0+4214+49953fda | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-docs ol 8 | 1:10.14.1-1.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-nodemon RHEL 8 | 0:1.18.3-1.module+el8+2632+6c5111ed | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-nodemon ol 8 | 0:1.18.3-1.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-packaging RHEL 8 | 0:17-3.module+el8+2873+aa7dfd9a | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | nodejs-packaging ol 8 | 0:17-3.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | npm RHEL 8 | 1:6.9.0-1.10.16.3.2.module+el8.0.0+4214+49953fda | [RHSA-2019:2925](https://patchblox.com/security/data/fix/linux/rhsa-2019-2925.md) | Sep 30, 2019 | | Linux | npm ol 8 | 1:6.4.1-1.10.14.1.1.module+el8.0.0+5349+4d6b561f | [ELSA-2019-2925](https://patchblox.com/security/data/fix/linux/elsa-2019-2925.md) | Sep 30, 2019 | | Linux | python-twisted Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-bin Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-bin 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-bin-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-bin Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-bin 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-bin-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-conch Ubuntu 18.04.6 LTS (bionic) | 1:17.9.0-2ubuntu0.1 | [python-twisted-conch 1:17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-conch-1-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-conch Ubuntu 20.04 LTS (focal) | 1:18.9.0-6ubuntu1 | [python-twisted-conch 1:18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-conch-1-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-core Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-core 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-core-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-core Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-core 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-core-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-mail Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-mail 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-mail-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-mail Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-mail 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-mail-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-names Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-names 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-names-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-names Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-names 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-names-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-news Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-news 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-news-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-news Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-news 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-news-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-runner Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-runner 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-runner-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-runner Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-runner 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-runner-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-web Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-web 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-web-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-web Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-web 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-web-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python-twisted-words Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python-twisted-words 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-twisted-words-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python-twisted-words Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python-twisted-words 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-twisted-words-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python3-twisted Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python3-twisted 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-twisted-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python3-twisted Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python3-twisted 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-twisted-18.9.0-6ubuntu1.md) | Aug 12, 2019 | | Linux | python3-twisted Ubuntu 24.10 (oracular) | 18.9.0-6ubuntu1 | [python3-twisted 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-python3-twisted-18.9.0-6ubuntu1.md) | Aug 13, 2019 | | Linux | python3-twisted Ubuntu 25.04 (plucky) | 18.9.0-6ubuntu1 | [python3-twisted 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-python3-twisted-18.9.0-6ubuntu1.md) | Aug 13, 2019 | | Linux | python3-twisted-bin Ubuntu 18.04.6 LTS (bionic) | 17.9.0-2ubuntu0.1 | [python3-twisted-bin 17.9.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-twisted-bin-17.9.0-2ubuntu0.1.md) | Mar 12, 2020 | | Linux | python3-twisted-bin Ubuntu 20.04 LTS (focal) | 18.9.0-6ubuntu1 | [python3-twisted-bin 18.9.0-6ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-twisted-bin-18.9.0-6ubuntu1.md) | Aug 12, 2019 | --- Data as of 2026-11-07T18:46:35Z UTC. 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