CVE-2019-1846

Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerability

Severity Score

7.4

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

A vulnerability in the Multiprotocol Label Switching (MPLS) Operations, Administration, and Maintenance (OAM) implementation of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to the incorrect handling of certain MPLS OAM packets. An attacker could exploit this vulnerability by sending malicious MPLS OAM packets to an affected device. A successful exploit could allow the attacker to cause the lspv_server process to crash. The crash could lead to system instability and the inability to process or forward traffic though the device, resulting in a DoS condition that require manual intervention to restore normal operating conditions.

Una vulnerabilidad en Multiprotocol Label Switching (MPLS) Operations, Administration, and Maintenance (OAM) implementation of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, podría permitir que un atacante adyacente sin autorización active una condición de Denegación de Servicio (DoS) en un dispositivo afectado. La vulnerabilidad es debido al manejo incorrecto de ciertos paquetes OAM de MPLS. Un atacante podría explotar esta vulnerabilidad enviando paquetes MPLS OAM maliciosos a un dispositivo afectado. Una explotación exito podría permitir al atacante causar el bloqueo del proceso lspv_server. el bloqueo podría provocar la inestabilidad del sistema y la incapacidad de procesar o reenviar el tráfico por medio del dispositivo, resultando en una condición DoS que requiere de la intervención manual para restablecer las condiciones normales de operación.

*Credits: N/A

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

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-20: Improper Input Validation

CAPEC

References (2)

URL	Tag	Source
http://www.securityfocus.com/bid/108363	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-asr9k-mpls-dos	2019-10-09

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"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9000v Search vendor "Cisco" for product "Asr 9000v"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9001 Search vendor "Cisco" for product "Asr 9001"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9006 Search vendor "Cisco" for product "Asr 9006"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9010 Search vendor "Cisco" for product "Asr 9010"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9901 Search vendor "Cisco" for product "Asr 9901"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9904 Search vendor "Cisco" for product "Asr 9904"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9906 Search vendor "Cisco" for product "Asr 9906"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9910 Search vendor "Cisco" for product "Asr 9910"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9912 Search vendor "Cisco" for product "Asr 9912"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	5.3.3 Search vendor "Cisco" for product "Ios Xr" and version "5.3.3"	sp10	Affected	in	Cisco Search vendor "Cisco"	Asr 9922 Search vendor "Cisco" for product "Asr 9922"	-	-	Safe