Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability

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• NewsExploited · CISA KEVKnown ransomware useCisco · Secure Firewall Management Center (FMC)

  Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability

  CVE-2026-20131

  Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain a deserialization of untrusted data vulnerability in the web-based management interface that could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device.

  CISA's required action · due 22 Mar 2026 for U.S. federal civilian agencies

  Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  Cited by CISA: sec.cloudapps.cisco.com · nvd.nist.gov

  Added to KEV 19 Mar 2026 · Source checked 4 Nov 2026, 16:35 UTC · CISA KEV entry

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