CVE-2021-43826

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
envoyproxy	envoy	< 1.18.6; >= 1.19.0, < 1.19.3; >= 1.20.0, < 1.20.2; >= 1.21.0, < 1.21.1

References

https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mfIssue Tracking, Third Party Advisory
https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145Patch, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mfIssue Tracking, Third Party Advisory

Timeline

Published: Feb 22, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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