CVE-2023-20270: Input Validation

Published Nov 1, 2023

Updated

A vulnerability in the interaction between the Server Message Block (SMB) protocol preprocessor and the Snort 3 detection engine for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error-checking when the Snort 3 detection engine is processing SMB traffic. An attacker could exploit this vulnerability by sending a crafted SMB packet stream through an affected device. A successful exploit could allow the attacker to cause the Snort process to reload, resulting in a DoS condition.

Affected Software

12 affected components

Cisco Secure Firewall Threat Defense=7.1.0

Cisco Secure Firewall Threat Defense=7.1.0.1

Cisco Secure Firewall Threat Defense=7.1.0.2

Cisco Secure Firewall Threat Defense=7.1.0.3

Cisco Secure Firewall Threat Defense=7.2.0

Cisco Secure Firewall Threat Defense=7.2.0.1

Cisco Secure Firewall Threat Defense=7.2.1

Cisco Secure Firewall Threat Defense=7.2.2

Cisco Secure Firewall Threat Defense=7.2.3

Cisco Secure Firewall Threat Defense=7.3.0

Cisco Secure Firewall Threat Defense=7.3.1

Cisco Secure Firewall Threat Defense=7.3.1.1

Event History

Nov 1, 2023

CVE Published

via MITRE·04:51 PM

Data Sourced

via MITRE·04:51 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·05:15 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is CVE-2023-20270?

CVE-2023-20270 is a vulnerability in the interaction between the Server Message Block (SMB) protocol preprocessor and the Snort 3 detection engine for Cisco Firepower Threat Defense (FTD) Software.

How does CVE-2023-20270 impact Cisco Firepower Threat Defense?

CVE-2023-20270 could allow an unauthenticated, remote attacker to bypass configured policies or cause a denial of service (DoS) condition.

What is the severity of CVE-2023-20270?

The severity of CVE-2023-20270 is medium, with a severity value of 5.8.

Which versions of Cisco Firepower Threat Defense are affected by CVE-2023-20270?

Cisco Firepower Threat Defense versions 7.1.0 to 7.3.1.1 are affected by CVE-2023-20270.

How can I fix CVE-2023-20270?

Apply the necessary updates or patches provided by Cisco to fix CVE-2023-20270.