CVE-2021-1624

Cisco IOS XE Software Rate Limiting Network Address Translation 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 the Rate Limiting Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause high CPU utilization in the Cisco QuantumFlow Processor of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to mishandling of the rate limiting feature within the QuantumFlow Processor. An attacker could exploit this vulnerability by sending large amounts of traffic that would be subject to NAT and rate limiting through an affected device. A successful exploit could allow the attacker to cause the QuantumFlow Processor utilization to reach 100 percent on the affected device, resulting in a DoS condition.

Una vulnerabilidad en la funcionalidad Rate Limiting Network Address Translation (NAT) de Cisco IOS XE Software podría permitir a un atacante remoto no autenticado causar un alto uso de la CPU en el procesador Cisco QuantumFlow de un dispositivo afectado, resultando en una condición de denegación de servicio (DoS). Esta vulnerabilidad es debido a un manejo inapropiado de la función de limitación de velocidad dentro del procesador QuantumFlow. Un atacante podría explotar esta vulnerabilidad mediante el envío de grandes cantidades de tráfico que estarían sujetas a NAT y a la limitación de velocidad mediante un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar que el uso del Procesador QuantumFlow alcance el 100 por ciento en el dispositivo afectado, 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

Partial

* 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

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ratenat-pYVLA7wM	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"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1000 Search vendor "Cisco" for product "Asr 1000"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1000-esp100 Search vendor "Cisco" for product "Asr 1000-esp100"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1000-x Search vendor "Cisco" for product "Asr 1000-x"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1001 Search vendor "Cisco" for product "Asr 1001"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1001-hx Search vendor "Cisco" for product "Asr 1001-hx"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1001-hx R Search vendor "Cisco" for product "Asr 1001-hx R"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1001-x Search vendor "Cisco" for product "Asr 1001-x"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1001-x R Search vendor "Cisco" for product "Asr 1001-x R"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1002 Search vendor "Cisco" for product "Asr 1002"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1002-hx Search vendor "Cisco" for product "Asr 1002-hx"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1002-hx R Search vendor "Cisco" for product "Asr 1002-hx R"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1002-x Search vendor "Cisco" for product "Asr 1002-x"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1002-x R Search vendor "Cisco" for product "Asr 1002-x R"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1004 Search vendor "Cisco" for product "Asr 1004"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1006 Search vendor "Cisco" for product "Asr 1006"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1006-x Search vendor "Cisco" for product "Asr 1006-x"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1009-x Search vendor "Cisco" for product "Asr 1009-x"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1013 Search vendor "Cisco" for product "Asr 1013"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	<= 17.3.3 Search vendor "Cisco" for product "Ios Xe" and version " <= 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 1023 Search vendor "Cisco" for product "Asr 1023"	-	-	Safe