// For flags

CVE-2019-1910

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 the 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 crafted IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending a crafted link-state PDU to an affected system to be processed. A successful exploit could allow the attacker to cause all routers within the IS–IS area to unexpectedly restart the IS–IS process, resulting in a DoS condition. This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS XR Software earlier than Release 6.6.3 and are configured with the IS–IS routing protocol. Cisco has confirmed that this vulnerability affects both Cisco IOS XR 32-bit Software and Cisco IOS XR 64-bit Software.

Una vulnerabilidad en la implementación de la funcionalidad del protocolo de enrutamiento intermedio en System–to–Intermediate La funcionalidad del protocolo del router en el software Cisco IOS XR podría permitir que un atacante no autenticado que se encuentre en la misma área cause una condición de denegación de servicio (DoS). . La vulnerabilidad se debe al procesamiento incorrecto de las unidades de datos de protocolo de estado de enlace (PDU) de IS–IS link-state. Un atacante podría aprovechar esta vulnerabilidad enviando una PDU de estado de enlace especialmente diseñada a un sistema afectado para su procesamiento. Una explotación con éxito podría permitir que el atacante provoque todos los routers dentro del el área IS–IS para reiniciar inesperadamente el proceso IS–IS lo que resulta en una condición DoS. Esta vulnerabilidad afecta a los dispositivos Cisco si están ejecutando una versión vulnerable del software Cisco IOS XR anterior a la versión 6.6.3 y están configurados con el protocolo de enrutamiento IS-IS. Cisco ha confirmado que esta vulnerabilidad afecta tanto al software Cisco IOS XR de 32 bits como al software Cisco IOS XR de 64 bits.

*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
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"
 < 6.6.3
Search vendor "Cisco" for product "Ios Xr" and version " < 6.6.3"
-
Affected
Cisco
Search vendor "Cisco"
 Carrier Routing System
Search vendor "Cisco" for product "Carrier Routing System"
 7.0.1
Search vendor "Cisco" for product "Carrier Routing System" and version "7.0.1"
-
Affected