// For flags

CVE-2019-1849

Cisco IOS XR Software BGP MPLS-Based EVPN Denial of Service Vulnerability

Severity Score

6.5
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in the Border Gateway Patrol (BGP) Multiprotocol Label Switching (MPLS)-based Ethernet VPN (EVPN) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs when the affected software processes specific EVPN routing information. An attacker could exploit this vulnerability by injecting malicious traffic patterns into the targeted EVPN network. A successful exploit could result in a crash of the l2vpn_mgr process on Provider Edge (PE) device members of the same EVPN instance (EVI). On each of the affected devices, a crash could lead to system instability and the inability to process or forward traffic through the device, resulting in a DoS condition that would require manual intervention to restore normal operating conditions.

Una vulnerabilidad en Border Gateway Patrol (BGP) Multiprotocol Label Switching (MPLS)-based Ethernet VPN (EVPN) implementation of Cisco IOS XR Software, podría permitir que un atacante adyacente no autorizado desencadene una condición de Denegación de Servicio (DoS) en un dispositivo afectado. La vulnerabilidad es debido a un error lógico que se produce cuando el software afectado procesa información específica de enrutamiento EVPN. Un atacante podría explotar esta vulnerabilidad al inyectar patrones de tráfico maliciosos en la red EVPN seleccionada. Una explotación con éxito podría provocar una caída del proceso l2vpn_mgr en los miembros del dispositivo Provider Edge (PE) de la misma instancia EVPN (EVI). En cada uno de los dispositivos afectados, una falla podría provocar la inestabilidad del sistema y la incapacidad de procesar o reenviar el tráfico por medio del dispositivo, lo que conllevaría en una condición DoS que deber contar con una intervención manual para restablecer las condiciones de operación normales.

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
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
  • 2019-05-16 CVE Published
  • 2024-10-06 EPSS Updated
  • 2024-11-21 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-754: Improper Check for Unusual or Exceptional Conditions
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"
 >= 6.1.0 < 6.3.3
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.1.0 < 6.3.3"
-
Affected
Cisco
Search vendor "Cisco"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 6.4.0 < 6.4.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.4.0 < 6.4.2"
-
Affected
Cisco
Search vendor "Cisco"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 6.5.0 < 6.5.2
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.5.0 < 6.5.2"
-
Affected
Cisco
Search vendor "Cisco"
 Ios Xr
Search vendor "Cisco" for product "Ios Xr"
 >= 6.6.0 < 6.6.1
Search vendor "Cisco" for product "Ios Xr" and version " >= 6.6.0 < 6.6.1"
-
Affected