High severity7.5NVD Advisory· Published Feb 22, 2022· Updated Jun 17, 2026
CVE-2021-43826
CVE-2021-43826
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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Affected products
4cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*range: <1.18.6
- (no CPE)range: < 1.18.6
Patches
Vulnerability mechanics
References
2- github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145nvdPatchThird Party Advisory
- github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mfnvdIssue TrackingThird Party Advisory
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