CVE-2020-35470

Name: CVE-2020-35470
Creator: NVD / NIST
Published: 2020-12-15T01:15:13.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2020-35470 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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).. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.97%

57.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.16.1

References

https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/issues/14087Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/pull/14131Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/issues/14087Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/pull/14131Patch, Third Party Advisory

Timeline

Published: Dec 15, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35470?

How severe is CVE-2020-35470?

CVE-2020-35470 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35470?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35470?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST