CVE entry · CVE-2026-20316
CVE-2026-20316: Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability
Cisco Secure Firewall Management Center (FMC) formerly known as Firepower Management Center contains a use of hard-coded password vulnerability that could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.
- Actively exploited: added to CISA’s KEV catalog on July 29, 2026.
- Used by ransomware, according to CISA.
- Remediation deadline for US federal agencies: August 1, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Cisco Secure Firewall Management Center (FMC), including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (sec.cloudapps.cisco.com)
- NVD entry (NIST)
- CISA KEV catalog
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Cisco Secure Email Gateway Relative Path Traversal Vulnerability
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Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
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Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
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Cisco Secure Email Gateway SQL Injection Vulnerability
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Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
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Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability