CVE-2021-40117

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by sending a crafted SSL/TLS packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Una vulnerabilidad en el administrador de mensajes SSL/TLS para el software Cisco Adaptive Security Appliance (ASA) y el software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se presenta porque los paquetes SSL/TLS entrantes no se procesan correctamente. Un atacante podría aprovechar esta vulnerabilidad mediante el envío de un paquete SSL/TLS diseñado a un dispositivo afectado. Una explotación con éxito podría permitir al atacante causar una recarga del dispositivo afectado, resultando en una condición de DoS

*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:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-08-25 CVE Reserved
2021-10-27 CVE Published
2024-07-12 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-400: Uncontrolled Resource Consumption

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-dos-4ygzLKU9	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5512-x Search vendor "Cisco" for product "Asa 5512-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5512-x Firmware Search vendor "Cisco" for product "Asa 5512-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5505 Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5505 Search vendor "Cisco" for product "Asa 5505"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5505 Firmware Search vendor "Cisco" for product "Asa 5505 Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5505 Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5515-x Search vendor "Cisco" for product "Asa 5515-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5515-x Firmware Search vendor "Cisco" for product "Asa 5515-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5525-x Search vendor "Cisco" for product "Asa 5525-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5525-x Firmware Search vendor "Cisco" for product "Asa 5525-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5545-x Search vendor "Cisco" for product "Asa 5545-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5545-x Firmware Search vendor "Cisco" for product "Asa 5545-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5555-x Search vendor "Cisco" for product "Asa 5555-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5555-x Firmware Search vendor "Cisco" for product "Asa 5555-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5580 Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5580 Search vendor "Cisco" for product "Asa 5580"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5580 Firmware Search vendor "Cisco" for product "Asa 5580 Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5580 Firmware" and version "009.014\(002.106\)"	-	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"	009.009\(002.085\) Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "009.009\(002.085\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5585-x Firmware Search vendor "Cisco" for product "Asa 5585-x Firmware"	009.014\(002.106\) Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "009.014\(002.106\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"		Adaptive Security Appliance Search vendor "Cisco" for product "Adaptive Security Appliance"				< 9.8.4.40 Search vendor "Cisco" for product "Adaptive Security Appliance" and version " < 9.8.4.40"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				< 6.2.3.17 Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.2.3.17"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.3.0 < 6.4.0.13 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.3.0 < 6.4.0.13"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.5.0 < 6.6.5 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.5.0 < 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"				>= 9.9.0 < 9.12.4.26 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.9.0 < 9.12.4.26"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.13.0 < 9.14.3.9 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.13.0 < 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 < 9.16.2.3 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.16.0 < 9.16.2.3"		-		Affected