// For flags

CVE-2019-1918

Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability

Severity Score

7.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in the implementation of Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected system to be processed. A successful exploit could allow the attacker to cause incorrect calculations used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS–IS process, resulting in a DoS condition.

Una vulnerabilidad en la implementación en la funcionalidad del protocolo de enrutamiento de Intermediate System–to–Intermediate System (IS–IS) en el software IOS XR de Cisco, podría permitir a un atacante no autenticado que se encuentre en la misma área de IS-IS causar una condición de denegación de servicio (DoS). La vulnerabilidad es debido al procesamiento incorrecto de las unidades de datos del protocolo (PDU) de estado de enlace de IS–IS. Un atacante podría explotar esta vulnerabilidad enviando PDU específicas de estado de enlace a un sistema afectado para su procesamiento. Una explotación con éxito podría permitir al atacante causar cálculos incorrectos utilizados en los grupos de enlace de riesgo compartido remoto ponderado (SRLG) o en el Algoritmo Flexible IGP. También podría causar trazas de vuelta en los registros o potencialmente causar que el dispositivo receptor bloquee el proceso IS–IS, resultando en una condición DoS.

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2018-12-06 CVE Reserved
  • 2019-08-07 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-11-21 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-682: Incorrect Calculation
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"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 6.5.2 < 6.6.3
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.2 < 6.6.3"
-
Affected
Cisco
Search vendor "Cisco"
 Carrier Routing System
Search vendor "Cisco" for product "Carrier Routing System"
 6.5.1
Search vendor "Cisco" for product "Carrier Routing System" and version "6.5.1"
-
Affected
Cisco
Search vendor "Cisco"
 Carrier Routing System
Search vendor "Cisco" for product "Carrier Routing System"
 6.5.3
Search vendor "Cisco" for product "Carrier Routing System" and version "6.5.3"
-
Affected