What is CVE-2021-32778?

CVE-2021-32778 is a vulnerability in Envoy that has high severity and can lead to high CPU utilization when a large number of HTTP/2 streams are reset.

How does the vulnerability in CVE-2021-32778 affect Envoy?

The vulnerability in CVE-2021-32778 affects Envoy versions 1.16.0 through 1.16.5, 1.17.0 through 1.17.4, 1.18.0 through 1.18.4, and 1.19.0.

What is the severity level of CVE-2021-32778?

CVE-2021-32778 has a severity rating of high.

How can I mitigate the vulnerability in CVE-2021-32778?

To mitigate the vulnerability in CVE-2021-32778, it is recommended to upgrade Envoy to version 1.19.0 or apply the necessary patches provided by Envoyproxy.

Where can I find more information about CVE-2021-32778?

You can find more information about CVE-2021-32778 on the Envoy proxy GitHub page and the official Envoy documentation.

Vulnerability/
CVE-2021-32778

high

7.5

CWE

834

24/8/2021

15/6/2022

CVE-2021-32778

First published: Tue Aug 24 2021(Updated: )

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy’s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Envoyproxy Envoy	>=1.16.0<1.16.5
Envoyproxy Envoy	>=1.17.0<1.17.4
Envoyproxy Envoy	>=1.18.0<1.18.4
Envoyproxy Envoy	=1.19.0

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Frequently Asked Questions

What is CVE-2021-32778?
CVE-2021-32778 is a vulnerability in Envoy that has high severity and can lead to high CPU utilization when a large number of HTTP/2 streams are reset.
How does the vulnerability in CVE-2021-32778 affect Envoy?
The vulnerability in CVE-2021-32778 affects Envoy versions 1.16.0 through 1.16.5, 1.17.0 through 1.17.4, 1.18.0 through 1.18.4, and 1.19.0.
What is the severity level of CVE-2021-32778?
CVE-2021-32778 has a severity rating of high.
How can I mitigate the vulnerability in CVE-2021-32778?
To mitigate the vulnerability in CVE-2021-32778, it is recommended to upgrade Envoy to version 1.19.0 or apply the necessary patches provided by Envoyproxy.
Where can I find more information about CVE-2021-32778?
You can find more information about CVE-2021-32778 on the Envoy proxy GitHub page and the official Envoy documentation.

collector/nvd-index
vendor/envoyproxy
canonical/envoyproxy envoy
version/envoyproxy envoy/1.16.0
version/envoyproxy envoy/1.17.0
version/envoyproxy envoy/1.18.0
version/envoyproxy envoy/1.19.0

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