AUGUST 4, 2026
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Case File

CVE-2021-43826

HIGH · CVSS 7.5 EPSS 1.06% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2022-02-22 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.5. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-43826
Severity
HIGH
CVSS
7.5
EPSS
1.06%

Original 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)