// For flags

CVE-2022-21655

Incorrect handling of internal redirects results in crash in Envoy

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. This will result in a denial of service. As a workaround turn off internal redirects if direct response entries are configured on the same listener.

Envoy es un proxy de borde y servicio de código abierto, diseñado para aplicaciones nativas de la nube. El enrutador común de Envoy fallará si una redirección interna selecciona una ruta configurada con acciones de respuesta directa o redirección. Esto resultará en una denegación de servicio. Como medida de mitigación, deshabilite las redirecciones internas si las entradas de respuesta directa están configuradas en el mismo receptor

A flaw was found in envoy. Due to incorrect handling of the common router, a segfault is possible when internal redirects are routes with a direct response entry.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-11-16 CVE Reserved
  • 2022-02-22 CVE Published
  • 2023-09-15 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-670: Always-Incorrect Control Flow Implementation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Envoyproxy
Search vendor "Envoyproxy"
 Envoy
Search vendor "Envoyproxy" for product "Envoy"
 < 1.18.6
Search vendor "Envoyproxy" for product "Envoy" and version " < 1.18.6"
-
Affected
Envoyproxy
Search vendor "Envoyproxy"
 Envoy
Search vendor "Envoyproxy" for product "Envoy"
 >= 1.19.0 < 1.19.3
Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.19.0 < 1.19.3"
-
Affected
Envoyproxy
Search vendor "Envoyproxy"
 Envoy
Search vendor "Envoyproxy" for product "Envoy"
 >= 1.20.0 < 1.20.2
Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.20.0 < 1.20.2"
-
Affected
Envoyproxy
Search vendor "Envoyproxy"
 Envoy
Search vendor "Envoyproxy" for product "Envoy"
 >= 1.21.0 < 1.21.1
Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.21.0 < 1.21.1"
-
Affected