Medium severity · published Mar 4, 2026
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…
6.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CS
Cisco Secure Firewall Threat Defense (FTD) Software · Cisco
6.4.0; 6.4.0.1; 6.4.0.3; 6.4.0.2; 6.4.0.4; 6.4.0.5; +34 more · source: vendor
SF
Secure Firewall Threat Defense · Cisco
6.2.3; 6.4.0; 6.4.0.1; 6.4.0.2; 6.4.0.3; 6.4.0.4; +34 more · source: NVD
Affected product
CS
Cisco Secure Firewall Threat Defense (FTD) Software
Cisco
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20064
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20064
Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-cmd-inj-mTzGZexf
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