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Vulnerabilities

Vulnerability · 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, caus…

Published Mar 4, 2026 · catalog updated Aug 11, 2026 · secure firewall threat defense

Check if you run it

No confirmed exploitation is on record for CVE-2026-20064. EPSS is 0.10%. Act only if a listed version of secure firewall threat defense is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.10%
Remediation
Advisory link
Affected products
cpe cisco/secure firewall threat defense

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/secure firewall threat defense6.2.3
  • cpe cisco/secure firewall threat defense6.4.0
  • cpe cisco/secure firewall threat defense6.4.0.1
  • cpe cisco/secure firewall threat defense6.4.0.2
  • cpe cisco/secure firewall threat defense6.4.0.3
  • cpe cisco/secure firewall threat defense6.4.0.4
  • cpe cisco/secure firewall threat defense6.4.0.5
  • cpe cisco/secure firewall threat defense6.4.0.6

How to fix CVE-2026-20064

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20064. EPSS is 0.10%. Act only if a listed version of secure firewall threat defense is installed.

Which versions are affected?

Compare what you have installed with cisco/secure firewall threat defense 6.2.3; cisco/secure firewall threat defense 6.4.0; cisco/secure firewall threat defense 6.4.0.1; cisco/secure firewall threat defense 6.4.0.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 0.10%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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.

  2. Aug 11, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-20064

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20064

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-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 inp

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.