CVE-2021-43824 HIGH

CVE-2021-43824: Null pointer dereference in envoy

Vendor Envoyproxy
Product envoy
Weakness CWE-476
Published February 22, 2022
Last update April 23, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 22, 2022 CVE published
April 23, 2025 Record updated