CVE-2021-43826

Published: Feb 22, 2022

Modified: Apr 23, 2025

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

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

Weaknesses (CWE)

CWE-416

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf

x_refsource_CONFIRM

https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145

x_refsource_MISC

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CVE-2021-43826

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References