Local Denial of Service Vulnerability in Cisco Secure Firewall Threat Defense Software
CVE-2026-20064

6.5MEDIUM

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20064?

A vulnerability has been identified in Cisco Secure Firewall Threat Defense Software that permits an authenticated, local attacker to induce an unexpected device reload, which leads to a denial of service (DoS) condition. This weakness arises from insufficient validation of user-supplied input. An attacker with a low-privileged account may exploit this issue by executing specially crafted commands through the command-line interface (CLI). A successful attack can result in the device becoming unresponsive due to the reload, affecting network availability.

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Affected Version(s)

Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0

Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.1

Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.3

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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