// For flags

CVE-2022-20756

Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A vulnerability in the RADIUS feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause the affected system to stop processing RADIUS packets. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by attempting to authenticate to a network or a service where the access server is using Cisco ISE as the RADIUS server. A successful exploit could allow the attacker to cause Cisco ISE to stop processing RADIUS requests, causing authentication/authorization timeouts, which would then result in legitimate requests being denied access. Note: To recover the ability to process RADIUS packets, a manual restart of the affected Policy Service Node (PSN) is required. See the Details section for more information.

Una vulnerabilidad en la función RADIUS de Cisco Identity Services Engine (ISE) podría permitir a un atacante remoto no autenticado causar que el sistema afectado deje de procesar paquetes RADIUS. Esta vulnerabilidad es debido al manejo inapropiado de determinadas peticiones RADIUS. Un atacante podría explotar esta vulnerabilidad intentando autenticarse en una red o un servicio en el que el servidor de acceso esté utilizando Cisco ISE como servidor RADIUS. Una explotación con éxito podría permitir al atacante hacer que Cisco ISE dejara de procesar las peticiones RADIUS, causando tiempos de espera de autenticación/autorización, lo que resulta en que sea denegado el acceso a peticiones legítimas. Nota: Para recuperar la capacidad de procesar paquetes RADIUS, es necesario reiniciar manualmente el Policy Service Node (PSN) afectado. Consulte la sección Detalles para más información

*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
Changed
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-11-02 CVE Reserved
  • 2022-04-06 CVE Published
  • 2023-10-28 EPSS Updated
  • 2024-11-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-399: Resource Management Errors
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.2.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.2.0"
patch17
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.4.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.4.0"
patch12
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.4.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.4.0"
patch13
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.4.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.4.0"
patch14
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch10
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch5
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch6
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch7
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch8
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.6.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.6.0"
patch9
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.7.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.7.0"
patch2
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.7.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.7.0"
patch3
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.7.0
Search vendor "Cisco" for product "Identity Services Engine" and version "2.7.0"
patch4
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
2.7.0.356
Search vendor "Cisco" for product "Identity Services Engine" and version "2.7.0.356"
patch1
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
3.0.0
Search vendor "Cisco" for product "Identity Services Engine" and version "3.0.0"
-
Affected
Cisco
Search vendor "Cisco"
Identity Services Engine
Search vendor "Cisco" for product "Identity Services Engine"
3.1
Search vendor "Cisco" for product "Identity Services Engine" and version "3.1"
-
Affected