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.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Swiftnio | Apple | 1.0.0 (including) | 1.4.0 (including) |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-httpd-0:2.4.29-41.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-nghttp2-0:1.39.2-1.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-apr-0:1.6.3-63.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-apr-util-0:1.6.1-48.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-brotli-0:1.0.6-7.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-curl-0:7.64.1-14.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-httpd-0:2.4.37-33.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-jansson-0:2.11-20.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_cluster-native-0:1.3.12-9.Final_redhat_2.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_jk-0:1.2.46-22.redhat_1.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_security-0:2.9.2-16.GA.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-nghttp2-0:1.39.2-4.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el6 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-httpd-0:2.4.29-41.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-nghttp2-0:1.39.2-1.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-apr-0:1.6.3-63.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-apr-util-0:1.6.1-48.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-brotli-0:1.0.6-7.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-curl-0:7.64.1-14.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-httpd-0:2.4.37-33.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-jansson-0:2.11-20.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_cluster-native-0:1.3.12-9.Final_redhat_2.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_jk-0:1.2.46-22.redhat_1.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_security-0:2.9.2-16.GA.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-nghttp2-0:1.39.2-4.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el7 | * |
| Openshift Service Mesh 1.0 | RedHat | kiali-0:v1.0.6.redhat1-1.el7 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-0:1.0.1-8.el8 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-cni-0:1.0.1-8.el8 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-grafana-0:6.2.2-21.el8 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-operator-0:1.0.1-8.el8 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-prometheus-0:2.7.2-22.el8 | * |
| OpenShift Service Mesh 1.0 | RedHat | servicemesh-proxy-0:1.0.1-7.el8 | * |
| Red Hat Enterprise Linux 8 | RedHat | nginx:1.14-8000020190830002848.f8e95b4e | * |
| Red Hat Enterprise Linux 8 | RedHat | nodejs:10-8000020190911085529.f8e95b4e | * |
| Red Hat Enterprise Linux 8 | RedHat | nghttp2-0:1.33.0-1.el8_0.1 | * |
| Red Hat Fuse 7.6.0 | RedHat | undertow | * |
| Red Hat Quay 3 | RedHat | quay3/clair-jwt:v2.0.9-7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | rh-nginx110-nginx-1:1.10.2-9.el6.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | httpd24-httpd-0:2.4.34-8.el6.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | httpd24-nghttp2-0:1.7.1-7.el6.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nginx110-nginx-1:1.10.2-9.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nginx112-nginx-1:1.12.1-3.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nginx114-nginx-1:1.14.1-1.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | httpd24-httpd-0:2.4.34-8.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | httpd24-nghttp2-0:1.7.1-7.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-nginx110-nginx-1:1.10.2-9.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-nginx112-nginx-1:1.12.1-3.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-nginx114-nginx-1:1.14.1-1.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nginx110-nginx-1:1.10.2-9.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nginx112-nginx-1:1.12.1-3.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nginx114-nginx-1:1.14.1-1.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | httpd24-httpd-0:2.4.34-8.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | httpd24-nghttp2-0:1.7.1-7.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nginx110-nginx-1:1.10.2-9.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nginx112-nginx-1:1.12.1-3.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nginx114-nginx-1:1.14.1-1.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | httpd24-httpd-0:2.4.34-8.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | httpd24-nghttp2-0:1.7.1-7.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nginx110-nginx-1:1.10.2-9.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nginx112-nginx-1:1.12.1-3.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nginx114-nginx-1:1.14.1-1.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | httpd24-httpd-0:2.4.34-8.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | httpd24-nghttp2-0:1.7.1-7.el7.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Text-Only JBCS | RedHat | * | |
| Nghttp2 | Ubuntu | bionic | * |
| Nghttp2 | Ubuntu | cosmic | * |
| Nghttp2 | Ubuntu | disco | * |
| Nghttp2 | Ubuntu | esm-apps/xenial | * |
| Nghttp2 | Ubuntu | esm-infra/bionic | * |
| Nghttp2 | Ubuntu | upstream | * |
| Nghttp2 | Ubuntu | xenial | * |
| Nginx | Ubuntu | bionic | * |
| Nginx | Ubuntu | cosmic | * |
| Nginx | Ubuntu | devel | * |
| Nginx | Ubuntu | disco | * |
| Nginx | Ubuntu | eoan | * |
| Nginx | Ubuntu | esm-infra/bionic | * |
| Nginx | Ubuntu | esm-infra/focal | * |
| Nginx | Ubuntu | esm-infra/xenial | * |
| Nginx | Ubuntu | focal | * |
| Nginx | Ubuntu | groovy | * |
| Nginx | Ubuntu | hirsute | * |
| Nginx | Ubuntu | impish | * |
| Nginx | Ubuntu | jammy | * |
| Nginx | Ubuntu | kinetic | * |
| Nginx | Ubuntu | lunar | * |
| Nginx | Ubuntu | mantic | * |
| Nginx | Ubuntu | noble | * |
| Nginx | Ubuntu | trusty | * |
| Nginx | Ubuntu | xenial | * |
| Nodejs | Ubuntu | bionic | * |
| Nodejs | Ubuntu | esm-apps/bionic | * |
| Nodejs | Ubuntu | esm-apps/xenial | * |
| Nodejs | Ubuntu | esm-infra-legacy/trusty | * |
| Nodejs | Ubuntu | groovy | * |
| Nodejs | Ubuntu | hirsute | * |
| Nodejs | Ubuntu | impish | * |
| Nodejs | Ubuntu | kinetic | * |
| Nodejs | Ubuntu | trusty | * |
| Nodejs | Ubuntu | trusty/esm | * |
| Nodejs | Ubuntu | xenial | * |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.