CVE-2026-20064
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A vulnerability in Cisco Secure Firewall Threat Defense (FTD) Software allows an authenticated local attacker with a low-privileged account to cause the device to unexpectedly reload, resulting in a DoS condition. This is due to improper validation of user-supplied input.
Risk Assessment
An attacker with a low-privileged account can cause device downtime, potentially affecting service availability.
Recommendation
Install Cisco updates. Restrict CLI access and monitor activities of low-privileged users.
Other vulnerabilities in Cisco Secure Firewall Threat Defense
See all- CVE-2026-20052Medium
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software allows an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This is due to a logic error in memory management during SSL packet inspection. A successful exploit could cause a DoS condition.
- CVE-2026-20017Medium
A vulnerability in the CLI of Cisco Secure FTD Software allows an authenticated local attacker with administrative credentials to execute arbitrary commands on the underlying operating system as root. This is due to insufficient input validation of user-supplied command arguments.
- CVE-2026-20007Medium
A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software allows an unauthenticated, remote attacker to bypass configured Snort rules and allow traffic onto the network that should have been dropped. This is due to a logic error in the integration of Snort Engine rules with FTD Software.
- CVE-2026-20006Medium
A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software allows an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a DoS condition. This is due to improper implementation of the TLS protocol. TLS 1.3 is not affected.
Original NVD description (English source)
A vulnerability in of Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, local attacker to cause the device to unexpectedly reload, causing a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the CLI prompt. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.