medium
5.3
CWE
20 358
Advisory Published
Updated

CVE-2021-34791: Input Validation

First published: Wed Oct 27 2021(Updated: )

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.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Adaptive Security Appliance<9.8.4.40
Cisco Firepower Threat Defense<6.4.0.12
Cisco Firepower Threat Defense>=6.5.0<6.6.5
Cisco Firepower Threat Defense>=6.7.0<6.7.0.2
Cisco Adaptive Security Appliance Software>=9.12.0<9.12.4.18
Cisco Adaptive Security Appliance Software>=9.13.0<9.14.2.15
Cisco Adaptive Security Appliance Software>=9.15.0<9.15.1.15
Cisco Asa 5512-x Firmware=009.008
Cisco Asa 5512-x Firmware=009.015
Cisco Asa 5512-x
Cisco Asa 5505 Firmware=009.008
Cisco Asa 5505 Firmware=009.015
Cisco Asa 5505
Cisco Asa 5515-x Firmware=009.008
Cisco Asa 5515-x Firmware=009.015
Cisco Asa 5515-x
Cisco Asa 5525-x Firmware=009.008
Cisco Asa 5525-x Firmware=009.015
Cisco Asa 5525-x
Cisco Asa 5545-x Firmware=009.008
Cisco Asa 5545-x Firmware=009.015
Cisco Asa 5545-x
Cisco Asa 5555-x Firmware=009.008
Cisco Asa 5555-x Firmware=009.015
Cisco Asa 5555-x
Cisco Asa 5580 Firmware=009.008
Cisco Asa 5580 Firmware=009.015
Cisco Asa 5580
Cisco Asa 5585-x Firmware=009.008
Cisco Asa 5585-x Firmware=009.015
Cisco Asa 5585-x

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-34791?

    CVE-2021-34791 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 severe is CVE-2021-34791?

    CVE-2021-34791 has a severity level of 5.3, which is considered medium.

  • Which software versions are affected by CVE-2021-34791?

    Cisco Adaptive Security Appliance (ASA) Software versions up to 9.8.4.40 and Cisco Firepower Threat Defense (FTD) Software versions up to 6.4.0.12 are affected by CVE-2021-34791.

  • How can an attacker exploit CVE-2021-34791?

    An unauthenticated, remote attacker can exploit CVE-2021-34791 to bypass the Application Level Gateway (ALG) and open unauthorized connections.

  • Where can I find more information about CVE-2021-34791?

    You can find more information about CVE-2021-34791 in the Cisco Security Advisory at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng.

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