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CVE-2021-34790

MEDIUM CVSS: 4.7 Published: 2021-10-27 Modified: 2026-08-11

Description

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 Platforms

Cisco Asa 5585-XCisco Asa 5525-XCisco Secure Firewall Threat DefenseCisco Adaptive Security Appliance SoftwareCisco Asa 5515-XCisco Asa 5545-X FirmwareCisco Asa 5585-X FirmwareCisco Asa 5512-X FirmwareCisco Adaptive Security ApplianceCisco Asa 5580 Firmware

Weakness Type

CWE-358, CWE-20

References