VULNERABILITY INTELLIGENCE

CVE-2021-43824

CVSS score7.5 HIGH
EPSS probability1.06%
CISA KEVNot currently listed
Published2022-02-22
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-476

Primary references