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CVE-2021-43824

nvd nist
Published: Feb 22, 2022Modified: Jun 17, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: 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.

Affected (4)

Products: Envoyproxy: Envoy
Envoyproxy
1 product
Envoy
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Envoyproxy
Envoy
Before 1.18.6
Envoy
From 1.19.0 to 1.19.3
Envoy
From 1.20.0 to 1.20.2
Envoy
From 1.21.0 to 1.21.1

Related CWEs

CWE-476
NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.

References (4)

Source: security-advisories@github.com
PatchThird Party Advisory
Source: security-advisories@github.com
Issue TrackingThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Issue TrackingThird Party Advisory

Timeline

No history available yet.