CVE-2021-32778
Description
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.
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Affected products
5cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*range: >=1.16.0,<1.16.5
- cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*
- (no CPE)range: >= 1.19.0, < 1.19.1
Patches
Vulnerability mechanics
References
2- github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chccnvdThird Party Advisory
- www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_historynvdRelease NotesVendor Advisory
News mentions
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