CVE-2021-34790 : What You Need to Know

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software are affected by multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature. These vulnerabilities could allow an unauthenticated remote attacker to bypass the ALG, opening unauthorized connections with a host behind the ALG.

Understanding CVE-2021-34790

This CVE involves bypass vulnerabilities in the ALG for NAT features in Cisco ASA Software and FTD Software, enabling attackers to create unauthorized connections.

What is CVE-2021-34790?

CVE-2021-34790 pertains to security vulnerabilities in Cisco ASA Software and Firepower Threat Defense Software's ALG for NAT, which can be exploited by remote unauthenticated attackers.

The Impact of CVE-2021-34790

The impact of this CVE is significant as it allows attackers to bypass security measures and create unauthorized connections behind the ALG.

Technical Details of CVE-2021-34790

This section provides more detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows remote attackers to bypass ALG, creating unauthorized connections behind the ALG.

Affected Systems and Versions

Affected systems include Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software.

Exploitation Mechanism

Attackers can exploit this vulnerability remotely without the need for authentication, potentially leading to unauthorized access.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-34790, immediate steps and long-term security practices should be employed.

Immediate Steps to Take

Cisco recommends applying security updates, monitoring network traffic, and implementing firewalls and access control lists.

Long-Term Security Practices

Regularly updating security patches, conducting security assessments, and staying informed about security best practices can help in the long-term prevention of similar vulnerabilities.

Patching and Updates

Stay informed about security advisories from Cisco and apply relevant patches promptly to ensure protection against known vulnerabilities.