CVE-2021-34791 Explained : Impact and Mitigation
Discover multiple vulnerabilities in Cisco ASA Software & FTD Software allowing unauthorized connections. Learn the impact, affected versions, and mitigation steps.
Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software are affected by multiple vulnerabilities in the Application Level Gateway for the Network Address Translation feature. These vulnerabilities could enable an attacker to bypass the ALG, leading to unauthorized connections with hosts behind the ALG.
Understanding CVE-2021-34791
This CVE-2021-34791 impacts the Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software due to vulnerabilities in the ALG for NAT feature.
What is CVE-2021-34791?
CVE-2021-34791 involves multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco ASA Software and FTD Software. Attackers can exploit these vulnerabilities to bypass ALG and establish unauthorized connections.
The Impact of CVE-2021-34791
These vulnerabilities pose a medium-severity risk with a CVSS base score of 4.7. An unauthenticated attacker could exploit them to connect with hosts behind the ALG without authorization.
Technical Details of CVE-2021-34791
The following details shed light on the vulnerability:
Vulnerability Description
The vulnerability allows remote attackers to bypass ALG in Cisco ASA Software and FTD Software, enabling unauthorized connections with hosts behind ALG.
Affected Systems and Versions
Affected systems include Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software.
Exploitation Mechanism
Attackers can exploit these vulnerabilities by using proof-of-concept exploit codes that are available for this specific advisory.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-34791, consider the following practices:
Immediate Steps to Take
It is crucial to apply security patches and updates provided by Cisco to address these vulnerabilities promptly.
Long-Term Security Practices
Ensure regular security assessments, network monitoring, and access controls to prevent unauthorized access to sensitive systems.
Patching and Updates
Stay informed about security advisories and updates from Cisco to implement the latest patches and protect your systems effectively.