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

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
22 February 2022

What is CVE-2021-43826?

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 Version(s)

envoy < 1.18.6 < 1.18.6

envoy >= 1.19.0, < 1.19.3 < 1.19.0, 1.19.3

envoy >= 1.20.0, < 1.20.2 < 1.20.0, 1.20.2

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM
https://github.com/envoyproxy/envoy/commit/ce0ae309057a21...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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