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Vulnerability · Published Feb 22, 2022 · Assigned by GitHub_M

CVE-2021-43826Crash when tunneling TCP over HTTP in Envoy

High 7.5

In plain English

A high-severity use-after-free in envoy from envoyproxy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.1%top 35.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 products (as reported)

VendorProductVersions
envoyproxy envoy < 1.18.6>= 1.19.0, < 1.19.3>= 1.20.0, < 1.20.2>= 1.21.0, < 1.21.1

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References