Cisco · Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
Updated August 12, 2026
A heap inspection vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is particularly concerning as it can be exploited remotely without authentication. Cisco has released patches to address this issue.
If left unpatched, this vulnerability could lead to significant disruption of network services, resulting in lost productivity and potential financial losses. An attacker could exploit this vulnerability to cause a denial of service, making it difficult for users to access critical resources.
Apply the latest Cisco security patches to affected devices as soon as possible to prevent exploitation. Ensure that all ASA and FTD devices are running the latest software versions.
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