Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| envoyproxy / envoy | affected >= 1.19.0, < 1.19.1; affected >= 1.18.0, < 1.18.4; affected >= 1.17.0, < 1.17.4; affected >= 1.16.0, < 1.16.5 |
CWE
CWE-834
References
- https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc
ADP enrichment
No English description supplied.