Medium [CVE-2026-20016 +3] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Authenticated Command Injection Vulnerabilities
This medium-severity Cisco advisory covers CVE-2026-20016 and CVE-2026-20017 and 2 more CVEs affecting Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.3, Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.2.
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Summary
Multiple vulnerabilities in the CLI feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, local attacker to cause a device to execute commands with elevated privileges or reload unexpectedly, resulting in a denial of service (DoS) condition.
For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities. This advisory is part …
Affected products named by the advisory: Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.1; Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.3; Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.2; Cisco Secure Firewall Threat Defense (FTD) Software 6.4.0.4; and 4 more.
- Scope: CVE-2026-20017, CVE-2026-20063, CVE-2026-20064: At the time of publication, these vulnerabilities affected Cisco Secure FTD Software, regardless of device configuration.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- There are no workarounds that address these vulnerabilities.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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