CVE-2021-43824 Null pointer dereference in envoy

2022-02-2222:15:10

CWE-476

GitHub_M

www.cve.org

cve-2021-43824

envoy

null pointer dereference

connect request

jwt filter

regex match

denial of service

upgrade

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.9

Confidence

High

EPSS

0.001

Percentile

40.1%

JSON

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.

CNA Affected

[
  {
    "product": "envoy",
    "vendor": "envoyproxy",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.20.0, < 1.20.2"
      },
      {
        "status": "affected",
        "version": ">= 1.19.0, < 1.19.3"
      },
      {
        "status": "affected",
        "version": "< 1.18.6"
      },
      {
        "status": "affected",
        "version": ">= 1.21.0, < 1.21.1"
      }
    ]
  }
]