AUGUST 4, 2026
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Case File

CVE-2021-43824

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

AI analysis pending.

Public Exploit Signal

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

GitHub PoC Links
github.com ↗ github.com ↗

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

CVE
CVE-2021-43824
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 a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.