CVE-2021-40117 : Vulnerability Insights and Analysis

This CVE-2021-40117 article provides details about a vulnerability in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software, allowing a denial of service attack.

Understanding CVE-2021-40117

This section delves deeper into the SSL/TLS Denial of Service Vulnerability affecting Cisco ASA and FTD Software.

What is CVE-2021-40117?

CVE-2021-40117 is a vulnerability in the SSL/TLS message handler for Cisco ASA Software and FTD Software, enabling an unauthenticated attacker to trigger a DoS attack on a device by sending malicious SSL/TLS packets.

The Impact of CVE-2021-40117

The vulnerability carries a CVSS base score of 8.6 (High severity) due to its potential to cause a device reload and Denial of Service condition, impacting availability.

Technical Details of CVE-2021-40117

This section covers the technical aspects of the CVE-2021-40117 vulnerability.

Vulnerability Description

The flaw arises from the improper processing of incoming SSL/TLS packets, allowing an attacker to exploit this weakness and force a device reload.

Affected Systems and Versions

Affected Product: Cisco Adaptive Security Appliance (ASA) Software
Affected Version: Not Applicable (n/a)

Exploitation Mechanism

The vulnerability can be exploited by sending a specifically crafted SSL/TLS packet to a vulnerable device, leading to a DoS condition.

Mitigation and Prevention

Learn how to mitigate the CVE-2021-40117 vulnerability to secure your systems.

Immediate Steps to Take

Cisco advises users to apply the necessary updates or patches provided by the vendor promptly.
Review and implement the configuration best practices recommended by Cisco.

Long-Term Security Practices

Regularly monitor security advisories from Cisco and other sources.
Conduct security assessments and penetration testing to identify vulnerabilities.

Patching and Updates

Stay informed about security updates released by Cisco for ASA and FTD Software.
Ensure timely application of patches to address known vulnerabilities.