Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy’s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.
CVSS Details
- CVSS 3.1 Base Score: 5.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Oracle_linux | — | oracle-linux-upgrade-istiooracle-linux-upgrade-istio-istioctloracle-linux-upgrade-istio-pilot-agentoracle-linux-upgrade-istio-pilot-discoveryoracle-linux-upgrade-kubeadmoracle-linux-upgrade-kubectloracle-linux-upgrade-kubeletoracle-linux-upgrade-olcne-agentoracle-linux-upgrade-olcne-api-serveroracle-linux-upgrade-olcnectloracle-linux-upgrade-olcne-grafana-chartoracle-linux-upgrade-olcne-istio-chartoracle-linux-upgrade-olcne-nginxoracle-linux-upgrade-olcne-olm-chartoracle-linux-upgrade-olcne-prometheus-chartoracle-linux-upgrade-olcne-utils | Nov 9, 2021 | Aug 24, 2021 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub