CVE-2017-3857

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in the Layer 2 Tunneling Protocol (L2TP) parsing function of Cisco IOS (12.0 through 12.4 and 15.0 through 15.6) and Cisco IOS XE (3.1 through 3.18) could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient validation of L2TP packets. An attacker could exploit this vulnerability by sending a crafted L2TP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS or Cisco IOS XE Software if the L2TP feature is enabled for the device and the device is configured as an L2TP Version 2 (L2TPv2) or L2TP Version 3 (L2TPv3) endpoint. By default, the L2TP feature is not enabled. Cisco Bug IDs: CSCuy82078.

Una vulnerabilidad en la función de análisis en Layer 2 Tunneling Protocol (L2TP) de Cisco IOS (12.0 en versiones hasta 12.4 y 15.0 en versiones hasta 15.6) y Cisco IOS XE (3.1 en versiones hasta 3.18) podría permitir a un atacante remoto no autenticado provocar recarga de los dispositivo afectado. La vulnerabilidad se debe a la insuficiente validación de los paquetes L2TP. Una explotación exitosa podría permitir al atacante hacer que el dispositivo afectado se vuelva a cargar, dando como resultado una condición de denegación de servicio (DoS). Esta vulnerabilidad afecta a los dispositivos Cisco que ejecutan una versión vulnerable de Cisco IOS o Cisco IOS XE Software si la característica L2TP está habilitada para el dispositivo y el dispositivo está configurado como punto final L2TP Versión 2 (L2TPv2) o L2TP Versión 3 (L2TPv3). De forma predeterminada, la función L2TP no está habilitada. ID de bugs de Cisco: CSCuy82078.

*Credits: N/A

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

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-21 CVE Reserved
2017-03-22 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-399: Resource Management Errors
CWE-400: Uncontrolled Resource Consumption

CAPEC

References (3)

URL	Tag	Source
http://www.securityfocus.com/bid/97010	Third Party Advisory
http://www.securitytracker.com/id/1038100	Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322-l2tp	Vdb Entry

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

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 Search vendor "Cisco" for product "Ios"				>= 12.0 <= 12.4 Search vendor "Cisco" for product "Ios" and version " >= 12.0 <= 12.4"		-		Affected
Cisco Search vendor "Cisco"		Ios Search vendor "Cisco" for product "Ios"				>= 15.0 <= 15.6 Search vendor "Cisco" for product "Ios" and version " >= 15.0 <= 15.6"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				>= 3.1.0 <= 3.18.0 Search vendor "Cisco" for product "Ios Xe" and version " >= 3.1.0 <= 3.18.0"		-		Affected