CVE-2021-39204

HIGH

Envoy < 1.16.4 and Pomerium < 0.14.8 - Denial of Service via HTTP/2 Stream Reset

Title source: llm

Description

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.

References (3)

Core 3

Core References

Not Applicable x_refsource_misc

https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ

Third Party Advisory x_refsource_misc

https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc

Third Party Advisory x_refsource_confirm

https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r

Scores

CVSS v3 7.5

EPSS 0.0161

EPSS Percentile 72.7%

Attack Vector NETWORK

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

Details

CWE

CWE-834

Status published

Products (5)

envoyproxy/envoy 1.19.0

envoyproxy/envoy < 1.16.4

pomerium/pomerium 0.15.0

pomerium/pomerium < 0.14.8

pomerium/pomerium 0 - 0.14.8Go

Published Sep 09, 2021

Tracked Since Feb 18, 2026