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CVE-2021-43826

nvd nist
Published: Feb 22, 2022Modified: Jun 17, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: NVD

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.

Affected (4)

Products: Envoyproxy: Envoy
Envoyproxy
1 product
Envoy
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Envoyproxy
Envoy
Before 1.18.6
Envoy
From 1.19.0 to 1.19.3
Envoy
From 1.20.0 to 1.20.2
Envoy
From 1.21.0 to 1.21.1

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (4)

Source: security-advisories@github.com
PatchThird Party Advisory
Source: security-advisories@github.com
Issue TrackingThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Issue TrackingThird Party Advisory

Timeline

No history available yet.