CVE-2020-3566

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory of an affected device. The vulnerability is due to insufficient queue management for Internet Group Management Protocol (IGMP) packets. An attacker could exploit this vulnerability by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to cause memory exhaustion, resulting in instability of other processes. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address this vulnerability.

Una vulnerabilidad en la funcionalidad del Distance Vector Multicast Routing Protocol (DVMRP) de Cisco IOS XR Software, podría permitir a un atacante remoto no autenticado agotar la memoria de proceso de un dispositivo afectado. La vulnerabilidad es debido a una gestión de cola insuficiente para los paquetes Internet Group Management Protocol (IGMP). Un atacante podría explotar esta vulnerabilidad mediante el envío de tráfico IGMP diseñado hacia un dispositivo afectado. Una explotación con éxito podría permitir a un atacante agotar la memoria, resultando en una inestabilidad de otros procesos. Estos procesos pueden incluir, pero no se limitan a, protocolos de enrutamiento interior y exterior. Cisco lanzará actualizaciones de software que abordan esta vulnerabilidad

Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.

*Credits: N/A

CVSS Scores

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

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

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-12 CVE Reserved
2020-08-29 CVE Published
2021-11-03 Exploited in Wild
2022-05-03 KEV Due Date
2024-07-27 EPSS Updated
2024-09-17 CVE Updated
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling

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-iosxr-dvmrp-memexh-dSmpdvfz	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 Xr Search vendor "Cisco" for product "Ios Xr"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	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"	6.4.2 Search vendor "Cisco" for product "Ios Xr" and version "6.4.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9922 Search vendor "Cisco" for product "Asr 9922"	-	-	Safe