NULL pointer dereference in Cisco Secure Firewall Threat Defense (Ftd) Software
CVE-2026-20064
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.001 (0.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 6.4.0, 6.4.0.1, 6.4.0.3
- Cisco Firepower Threat Defense Software — versions 6.2.3, 6.4.0, 6.4.0.1
- Cisco Secure Firewall Threat Defense — versions 6.2.3, 6.4.0, 6.4.0.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20064?
- CVE-2026-20064 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense (Ftd) Software, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-03-04.
- How severe is CVE-2026-20064?
- Medium severity. CVSS v3 base score is 6.5 out of 10.