Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.
https://www.synology.com/security/advisory/Synology_SA_19_33
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.debian.org/security/2020/dsa-4669
https://www.debian.org/security/2019/dsa-4511
https://www.debian.org/security/2019/dsa-4505
https://usn.ubuntu.com/4099-1/
https://support.f5.com/csp/article/K02591030?utm_source=f5support&%3Butm_medium=RSS
https://support.f5.com/csp/article/K02591030
https://security.netapp.com/advisory/ntap-20190823-0005/
https://security.netapp.com/advisory/ntap-20190823-0002/
https://seclists.org/bugtraq/2019/Sep/1
https://seclists.org/bugtraq/2019/Aug/40
https://kc.mcafee.com/corporate/index?page=content&id=SB10296
https://kb.cert.org/vuls/id/605641/
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
https://access.redhat.com/errata/RHSA-2019:3935
https://access.redhat.com/errata/RHSA-2019:3933
https://access.redhat.com/errata/RHSA-2019:3932
https://access.redhat.com/errata/RHSA-2019:3041
https://access.redhat.com/errata/RHSA-2019:2966
https://access.redhat.com/errata/RHSA-2019:2955
https://access.redhat.com/errata/RHSA-2019:2949
https://access.redhat.com/errata/RHSA-2019:2939
https://access.redhat.com/errata/RHSA-2019:2925
https://access.redhat.com/errata/RHSA-2019:2799
https://access.redhat.com/errata/RHSA-2019:2775
https://access.redhat.com/errata/RHSA-2019:2746
https://access.redhat.com/errata/RHSA-2019:2745
https://access.redhat.com/errata/RHSA-2019:2692
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html