What is CVE-2021-39204?

CVE-2021-39204 is a vulnerability that affects Pomerium and Envoy, leading to high CPU utilization and a potential DoS condition.

What software is affected by CVE-2021-39204?

Envoy versions up to 1.16.4, Envoy versions 1.17.0 to 1.17.4, Envoy versions 1.18.0 to 1.18.4, Envoy version 1.19.0, and Pomerium versions up to 0.14.8 and version 0.15.0 are affected by CVE-2021-39204.

What is the severity of CVE-2021-39204?

CVE-2021-39204 has a severity rating of 7.5 (high).

How does CVE-2021-39204 impact the affected software?

CVE-2021-39204 can lead to high CPU utilization and a potential DoS (Denial of Service) condition when a large number of HTTP/2 streams are reset.

How can I mitigate the vulnerability CVE-2021-39204?

To mitigate CVE-2021-39204, ensure you have updated to a fixed version of Pomerium or Envoy as recommended by the respective advisory.

Vulnerability/
CVE-2021-39204

high

7.5

CWE

834

9/9/2021

4/8/2024

CVE-2021-39204: Excessive CPU usage in Pomerium

First published: Thu Sep 09 2021(Updated: )

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Envoy Proxy	<=1.16.4
Envoy Proxy	>=1.17.0<1.17.4
Envoy Proxy	>=1.18.0<1.18.4
Envoy Proxy	=1.19.0
Pomerium	<0.14.8
Pomerium	=0.15.0

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Frequently Asked Questions

What is CVE-2021-39204?
CVE-2021-39204 is a vulnerability that affects Pomerium and Envoy, leading to high CPU utilization and a potential DoS condition.
What software is affected by CVE-2021-39204?
Envoy versions up to 1.16.4, Envoy versions 1.17.0 to 1.17.4, Envoy versions 1.18.0 to 1.18.4, Envoy version 1.19.0, and Pomerium versions up to 0.14.8 and version 0.15.0 are affected by CVE-2021-39204.
What is the severity of CVE-2021-39204?
CVE-2021-39204 has a severity rating of 7.5 (high).
How does CVE-2021-39204 impact the affected software?
CVE-2021-39204 can lead to high CPU utilization and a potential DoS (Denial of Service) condition when a large number of HTTP/2 streams are reset.
How can I mitigate the vulnerability CVE-2021-39204?
To mitigate CVE-2021-39204, ensure you have updated to a fixed version of Pomerium or Envoy as recommended by the respective advisory.

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agent/event
agent/source
agent/softwarecombine
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/envoyproxy
canonical/envoy proxy
version/envoy proxy/1.16.4
version/envoy proxy/1.17.0
version/envoy proxy/1.18.0
version/envoy proxy/1.19.0
vendor/pomerium
canonical/pomerium
version/pomerium/0.15.0

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