What is 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 ` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade.

How severe is CVE-2021-43826?

This vulnerability has a severity rating of HIGH with a CVSS score of 7.5 out of 10.

What type of vulnerability is CVE-2021-43826?

This is classified as CWE-416, which is a common weakness in software security.

CVE-2021-43826 - HIGH Severity | CVSS 7.5

Vulnerability Description

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 no workarounds for this issue. Users are advised to upgrade.

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