CVE-2021-40125

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IKEv2 Site-to-Site VPN Denial of Service Vulnerability

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. This vulnerability is due to improper control of a resource. An attacker with the ability to spoof a trusted IKEv2 site-to-site VPN peer and in possession of valid IKEv2 credentials for that peer could exploit this vulnerability by sending malformed, authenticated IKEv2 messages to an affected device. A successful exploit could allow the attacker to trigger a reload of the device.

Una vulnerabilidad en la implementación del Intercambio de Claves de Internet Versión 2 (IKEv2) del software Cisco Adaptive Security Appliance (ASA) y del software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto autenticado desencadenar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido a un control inapropiado de un recurso. Un atacante con la capacidad de falsificar un peer IKEv2 site-to-site VPN confiable y en posesión de credenciales IKEv2 válidas para ese peer podría explotar esta vulnerabilidad mediante el envío de mensajes IKEv2 malformados y autenticados a un dispositivo afectado. Una explotación con éxito podría permitir al atacante desencadenar una recarga del dispositivo

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-25 CVE Reserved
2021-10-27 CVE Published
2023-05-20 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-416: Use After Free

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-asaftd-ikev2-dos-g4cmrr7C	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"	Asa 5512-x Firmware Search vendor "Cisco" for product "Asa 5512-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5512-x Search vendor "Cisco" for product "Asa 5512-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5505 Firmware Search vendor "Cisco" for product "Asa 5505 Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5505 Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5505 Search vendor "Cisco" for product "Asa 5505"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5515-x Firmware Search vendor "Cisco" for product "Asa 5515-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5515-x Search vendor "Cisco" for product "Asa 5515-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5525-x Firmware Search vendor "Cisco" for product "Asa 5525-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5525-x Search vendor "Cisco" for product "Asa 5525-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5545-x Firmware Search vendor "Cisco" for product "Asa 5545-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5545-x Search vendor "Cisco" for product "Asa 5545-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5555-x Firmware Search vendor "Cisco" for product "Asa 5555-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5555-x Search vendor "Cisco" for product "Asa 5555-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5580 Firmware Search vendor "Cisco" for product "Asa 5580 Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5580 Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5580 Search vendor "Cisco" for product "Asa 5580"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5585-x Firmware Search vendor "Cisco" for product "Asa 5585-x Firmware"	009.016\(001.025\) Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "009.016\(001.025\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				< 6.4.0.13 Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.4.0.13"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.6.0 < 6.6.5 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.6.0 < 6.6.5"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.7.0 < 6.7.0.3 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.7.0 < 6.7.0.3"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 7.0.0 < 7.0.1 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 7.0.0 < 7.0.1"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.8.0 < 9.8.4.40 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.8.0 < 9.8.4.40"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.9.0 < 9.12.4.30 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.9.0 < 9.12.4.30"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.14.0 < 9.14.3.9 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.14.0 < 9.14.3.9"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.15.0 < 9.15.1.17 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.15.0 < 9.15.1.17"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.16.0 < 9.16.2 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.16.0 < 9.16.2"		-		Affected