CVE-2020-3555: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SIP Denial of Service Vulnerability

Q: What is the vulnerability ID of this Cisco ASA and FTD Software vulnerability?

The vulnerability ID of this Cisco ASA and FTD Software vulnerability is CVE-2020-3555.

Q: What is the severity of CVE-2020-3555?

The severity of CVE-2020-3555 is high, with a severity value of 7.5.

Q: How can an attacker exploit CVE-2020-3555?

An unauthenticated, remote attacker can exploit CVE-2020-3555 to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.

Q: Is there a fix available for CVE-2020-3555?

Yes, Cisco has released software updates to address the vulnerability. Please refer to the Cisco Security Advisory for more information.

Published Oct 21, 2020

Updated

A vulnerability in the SIP inspection process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. An attacker could exploit this vulnerability by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.

Affected Software

17 affected components

Cisco Adaptive Security Appliance<9.6.4.43

Cisco Firepower Threat Defense<=6.2.2

Cisco Firepower Threat Defense>=6.3.0<6.3.0.6

Cisco Firepower Threat Defense>=6.4.0<6.4.0.10

Cisco Firepower Threat Defense>=6.5.0<6.5.0.5

Cisco Firepower Threat Defense=6.6.0

Cisco Adaptive Security Appliance Software>=9.7.0<9.8.4.24

Cisco Adaptive Security Appliance Software>=9.9.0<9.9.2.80

Cisco Adaptive Security Appliance Software>=9.10.0<9.10.1.43

Cisco Adaptive Security Appliance Software>=9.12.0<9.12.4.2

Cisco Adaptive Security Appliance Software>=9.13.0<9.13.1.13

Cisco Adaptive Security Appliance Software>=9.14.0<9.14.1.19

Cisco Secure Firewall Threat Defense<=6.2.2

Cisco Secure Firewall Threat Defense>=6.3.0<6.3.0.6

Cisco Secure Firewall Threat Defense>=6.4.0<6.4.0.10

Cisco Secure Firewall Threat Defense>=6.5.0<6.5.0.5

Cisco Secure Firewall Threat Defense=6.6.0

Event History

Oct 21, 2020

CVE Published

via MITRE·06:41 PM

Data Sourced

via MITRE·06:41 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·07:15 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the vulnerability ID of this Cisco ASA and FTD Software vulnerability?

The vulnerability ID of this Cisco ASA and FTD Software vulnerability is CVE-2020-3555.

What is the severity of CVE-2020-3555?

The severity of CVE-2020-3555 is high, with a severity value of 7.5.

Which software is affected by CVE-2020-3555?

Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software are affected by CVE-2020-3555.

How can an attacker exploit CVE-2020-3555?

An unauthenticated, remote attacker can exploit CVE-2020-3555 to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.

Is there a fix available for CVE-2020-3555?