CVE-2020-35470

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-15 · updated 2026-06-17

Description

Envoy before 1.16.1 logs an incorrect downstream address because it considers only the directly connected peer, not the information in the proxy protocol header. This affects situations with tcp-proxy as the network filter (not HTTP filters).

Affected products

envoyproxy envoy: before 1.16.1 — fixed in 1.16.1

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.16.1. Check the vendor advisory for mitigations.

References

https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1
https://github.com/envoyproxy/envoy/issues/14087
https://github.com/envoyproxy/envoy/pull/14131
https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1
https://github.com/envoyproxy/envoy/issues/14087
https://github.com/envoyproxy/envoy/pull/14131

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