CVE-2022-21655: Envoyproxy Envoy

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. This will result in a denial of service. As a workaround turn off internal redirects if direct response entries are configured on the same listener.

Affected products

• Envoyproxy Envoy: before 1.18.6 (fixed in 1.18.6); from 1.19.0, before 1.19.3 (fixed in 1.19.3); from 1.20.0, before 1.20.2 (fixed in 1.20.2); from 1.21.0, before 1.21.1 (fixed in 1.21.1)

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