CVE-2022-23606: Envoyproxy Envoy

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Affected products

• Envoyproxy Envoy: from 1.20.0, before 1.20.2 (fixed in 1.20.2); version 1.21.0 only

Published 2022-02-22. Last modified 2026-06-17.