All vulnerabilities

Servers and applications

CVE-2021-43826

Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are…

Severity
High 7.5
Published
22 Feb 2022
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.18.6, 1.19.3, 1.20.2, 1.21.1
Sources
NVD

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • Every version before 1.18.6
  • From 1.19.0 before 1.19.3
  • From 1.20.0 before 1.20.2
  • From 1.21.0 before 1.21.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-43826
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-43826