UpHeron
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Servers and applications

CVE-2021-39204

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.

Severity
High 7.5
Published
9 Sept 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.17.4, 1.18.4
Sources
NVD

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • Every version up to 1.16.4
  • From 1.17.0 before 1.17.4
  • From 1.18.0 before 1.18.4
  • Version 1.19.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-39204
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-39204