CVE-2021-1611

Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers EoGRE Denial of Service Vulnerability

Severity Score

8.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in Ethernet over GRE (EoGRE) packet processing of Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9800 Family Wireless Controller, Embedded Wireless Controller, and Embedded Wireless on Catalyst 9000 Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper processing of malformed EoGRE packets. An attacker could exploit this vulnerability by sending malicious packets to the affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Una vulnerabilidad en el procesamiento de paquetes Ethernet sobre GRE (EoGRE) de Cisco IOS XE Wireless Controller Software para Cisco Catalyst 9800 Family Wireless Controller, Embedded Wireless Controller, y Embedded Wireless on Catalyst 9000 Series Switches, podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido al procesamiento incorrecto de paquetes EoGRE malformados. Un atacante podría explotar esta vulnerabilidad mediante el envío de paquetes maliciosos al dispositivo afectado. Una explotación con éxito podría permitir al atacante causar la recarga del dispositivo, resultando en una condición de DoS

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-09-23 CVE Published
2024-06-07 EPSS Updated
2024-11-07 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
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-gre-6u4ELzAT	2023-11-07

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 Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800 Search vendor "Cisco" for product "Catalyst 9800"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-40 Search vendor "Cisco" for product "Catalyst 9800-40"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-80 Search vendor "Cisco" for product "Catalyst 9800-80"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-cl Search vendor "Cisco" for product "Catalyst 9800-cl"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-l Search vendor "Cisco" for product "Catalyst 9800-l"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-l-c Search vendor "Cisco" for product "Catalyst 9800-l-c"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	< 17.3.1 Search vendor "Cisco" for product "Ios Xe" and version " < 17.3.1"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800-l-f Search vendor "Cisco" for product "Catalyst 9800-l-f"	-	-	Safe