Exploited vulnerability · CISA KEV

Is CVE-2026-20316 exploited? Yes: in CISA KEV since 29 Jul 2026

Gociux · Cisco Secure Firewall Management Center (FMC) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-20316, Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 Jul 2026, the day it was published. It is known to be used in ransomware campaigns. It affects Cisco Secure Firewall Management Center (FMC), an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

What it is

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.

What to do

1. Check whether you run it. Look for Secure Firewall Management Center (FMC) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 29 Jul 2026.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Secure Firewall Management Center (FMC)

• CVE-2026-20131: Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability (19 Mar 2026)

References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-
• nvd.nist.gov/vuln/detail/CVE-2026-20316

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2026 · Cisco scorecard · act-now radar.