CVE-2021-1394

Cisco IOS XE Software for Network Convergence System 520 Routers Denial of Service Vulnerability

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in the ingress traffic manager of Cisco IOS XE Software for Cisco Network Convergence System (NCS) 520 Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the web management interface of an affected device. This vulnerability is due to incorrect processing of certain IPv4 TCP traffic that is destined to an affected device. An attacker could exploit this vulnerability by sending a large number of crafted TCP packets to the affected device. A successful exploit could allow the attacker to cause the web management interface to become unavailable, resulting in a DoS condition. Note: This vulnerability does not impact traffic that is going through the device or going to the Management Ethernet interface of the device.

Una vulnerabilidad en el administrador de tráfico de la entrada del Software Cisco IOS XE para enrutadores Cisco Network Convergence System (NCS) 520, podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en la interfaz de administración web de un dispositivo afectado. Esta vulnerabilidad es debido al procesamiento incorrecto de cierto tráfico IPv4 TCP destinado a un dispositivo afectado. Un atacante podría explotar esta vulnerabilidad mediante el envío de una gran cantidad de paquetes TCP diseñados al dispositivo afectado. Una explotación con éxito podría permitir que el atacante cause que la interfaz de administración web deje de estar disponible, resultando en una condición de DoS. Nota: esta vulnerabilidad no afecta el tráfico que atraviesa el dispositivo o que se dirige a la interfaz Ethernet de administración del dispositivo

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-03-24 CVE Published
2024-03-27 EPSS Updated
2024-11-08 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-399: Resource Management Errors

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs520-tcp-ZpzzOxB	2023-11-07

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 Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1 Search vendor "Cisco" for product "Ios Xe" and version "16.10.1"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1a Search vendor "Cisco" for product "Ios Xe" and version "16.10.1a"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1b Search vendor "Cisco" for product "Ios Xe" and version "16.10.1b"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1c Search vendor "Cisco" for product "Ios Xe" and version "16.10.1c"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1d Search vendor "Cisco" for product "Ios Xe" and version "16.10.1d"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1e Search vendor "Cisco" for product "Ios Xe" and version "16.10.1e"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1f Search vendor "Cisco" for product "Ios Xe" and version "16.10.1f"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1g Search vendor "Cisco" for product "Ios Xe" and version "16.10.1g"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.10.1s Search vendor "Cisco" for product "Ios Xe" and version "16.10.1s"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				17.2.1v Search vendor "Cisco" for product "Ios Xe" and version "17.2.1v"		-		Affected