CVE-2026-20064 Null dereference in Cisco Secure Firewall Threat Defense (FTD) Software
A local attacker with low privileges can cause a Cisco Secure Firewall Threat Defense device to reload, resulting in a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20064?
CVE-2026-20064 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense, published on 4 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-20064?
It affects 1 product.
Products include Cisco Secure Firewall Threat Defense.
How do I fix CVE-2026-20064?
No fix has been published for CVE-2026-20064 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20064 being exploited?
There is no known exploitation of CVE-2026-20064 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Threat Defense
- CVE-2024-20412 Hardcoded credentials in Cisco Firepower Threat Defense Software
- CVE-2024-20330 Memory corruption in Cisco Firepower Threat Defense Software
- CVE-2024-20339 Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability
- CVE-2024-20351 Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability
- CVE-2023-20083 Denial of service in Cisco Firepower Threat Defense Software
Sources
Also known as GHSA-h526-7r62-gcj9.