CVE-2021-1422

Cisco Adaptive Security Appliance Software Release 9.16.1 and Cisco Firepower Threat Defense Software Release 7.0.0 IPsec Denial of Service Vulnerability

Severity Score

7.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

A vulnerability in the software cryptography module of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker or an unauthenticated attacker in a man-in-the-middle position to cause an unexpected reload of the device that results in a denial of service (DoS) condition. The vulnerability is due to a logic error in how the software cryptography module handles specific types of decryption errors. An attacker could exploit this vulnerability by sending malicious packets over an established IPsec connection. A successful exploit could cause the device to crash, forcing it to reload. Important: Successful exploitation of this vulnerability would not cause a compromise of any encrypted data. Note: This vulnerability affects only Cisco ASA Software Release 9.16.1 and Cisco FTD Software Release 7.0.0.

Una vulnerabilidad en el módulo de criptografía de software de Cisco Adaptive Security Appliance (ASA) Software y Cisco Firepower Threat Defense (FTD) Software, podría permitir a un atacante remoto autenticado o a un atacante no autenticado en una posición de tipo man-in-the-middle causar una recarga inesperada del dispositivo que resulta en una condición de denegación de servicio (DoS). La vulnerabilidad es debido a un error lógico en como el módulo de criptografía del software maneja tipos específicos de errores de descifrado. Un atacante podría explotar esta vulnerabilidad mediante el envío de paquetes maliciosos a través de una conexión IPsec establecida. Una explotación con éxito podría causar el bloqueo del dispositivo, obligándolo a recargarse. Importante: Una explotación con éxito de esta vulnerabilidad no causaría un compromiso de ningún dato encriptado. Nota: Esta vulnerabilidad sólo afecta la versión 9.16.1 del software Cisco ASA y la versión 7.0.0 del software Cisco FTD

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-07-16 CVE Published
2023-03-08 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion

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-asa-ftd-ipsec-dos-TFKQbgWC	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"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Adaptive Security Virtual Appliance Search vendor "Cisco" for product "Adaptive Security Virtual Appliance"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2100 Search vendor "Cisco" for product "Firepower 2100"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2110 Search vendor "Cisco" for product "Firepower 2110"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2120 Search vendor "Cisco" for product "Firepower 2120"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2130 Search vendor "Cisco" for product "Firepower 2130"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2140 Search vendor "Cisco" for product "Firepower 2140"	-	-	Safe
Cisco Search vendor "Cisco"	Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"	9.16.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version "9.16.1"	-	Affected	in	Cisco Search vendor "Cisco"	Ftd Virtual Search vendor "Cisco" for product "Ftd Virtual"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Adaptive Security Virtual Appliance Search vendor "Cisco" for product "Adaptive Security Virtual Appliance"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2100 Search vendor "Cisco" for product "Firepower 2100"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2110 Search vendor "Cisco" for product "Firepower 2110"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2120 Search vendor "Cisco" for product "Firepower 2120"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2130 Search vendor "Cisco" for product "Firepower 2130"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Firepower 2140 Search vendor "Cisco" for product "Firepower 2140"	-	-	Safe
Cisco Search vendor "Cisco"	Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"	7.0.0.0 Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.0.0.0"	-	Affected	in	Cisco Search vendor "Cisco"	Ftd Virtual Search vendor "Cisco" for product "Ftd Virtual"	-	-	Safe