CVE-2021-34790: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities
Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2021-34790?
CVE-2021-34790 is a vulnerability in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software.
How does CVE-2021-34790 affect Cisco ASA Software?
CVE-2021-34790 affects Cisco ASA Software versions up to 9.8.4.40, 9.12.x, 9.13.x, 9.14.x, and 9.15.x.
How does CVE-2021-34790 affect Cisco Firepower Threat Defense?
CVE-2021-34790 affects Cisco Firepower Threat Defense versions up to 6.4.0.12, 6.5.0 to 6.6.5, and 6.7.0 to 6.7.0.2.
What is the severity of CVE-2021-34790?
CVE-2021-34790 has a severity rating of 5.3 (Medium).
Where can I find more information about CVE-2021-34790?
You can find more information about CVE-2021-34790 in the Cisco Security Advisory at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng.