What is CVE-2021-39162?

CVE-2021-39162 is a vulnerability in the Pomerium open source identity-aware access proxy, based on the Envoy proxy, that can lead to a denial-of-service (DoS) attack.

How does CVE-2021-39162 impact Envoy?

CVE-2021-39162 can cause an abnormal termination of Envoy if an H/2 GOAWAY and SETTINGS frame are received in the same IO event, leading to a DoS attack.

Is my version of Envoy affected by CVE-2021-39162?

Versions of Envoy up to and excluding 1.18.4 are affected by CVE-2021-39162.

Is my version of Pomerium affected by CVE-2021-39162?

Pomerium version 0.15.0 is affected by CVE-2021-39162.

How can I fix CVE-2021-39162?

To fix CVE-2021-39162, it is recommended to upgrade to a version of Envoy that is not affected or apply the necessary security patches.

Vulnerability/
CVE-2021-39162

high

8.6

CWE

754

9/9/2021

4/8/2024

CVE-2021-39162: Incorrect handling of H2 GOAWAY + SETTINGS frames

First published: Thu Sep 09 2021(Updated: )

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Envoyproxy Envoy	<1.18.4
Envoyproxy Envoy	=1.19.0
Pomerium Pomerium	=0.15.0

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Frequently Asked Questions

What is CVE-2021-39162?
CVE-2021-39162 is a vulnerability in the Pomerium open source identity-aware access proxy, based on the Envoy proxy, that can lead to a denial-of-service (DoS) attack.
How does CVE-2021-39162 impact Envoy?
CVE-2021-39162 can cause an abnormal termination of Envoy if an H/2 GOAWAY and SETTINGS frame are received in the same IO event, leading to a DoS attack.
Is my version of Envoy affected by CVE-2021-39162?
Versions of Envoy up to and excluding 1.18.4 are affected by CVE-2021-39162.
Is my version of Pomerium affected by CVE-2021-39162?
Pomerium version 0.15.0 is affected by CVE-2021-39162.
How can I fix CVE-2021-39162?
To fix CVE-2021-39162, it is recommended to upgrade to a version of Envoy that is not affected or apply the necessary security patches.

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vendor/envoyproxy
canonical/envoyproxy envoy
version/envoyproxy envoy/1.19.0
vendor/pomerium
canonical/pomerium pomerium
version/pomerium pomerium/0.15.0

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