CVE-2021-43826

HIGH

Envoy < 1.18.6 - Use-After-Free in Upstream Tunneling

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Issue Tracking, Third Party Advisory x_refsource_confirm
https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf

Scores

CVSS v3 7.5
EPSS 0.0105
EPSS Percentile 60.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (1)
envoyproxy/envoy < 1.18.6
Published Feb 22, 2022
Tracked Since Feb 18, 2026