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

Vulnerability Name

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

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

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

Additional Notes

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh
• https://nvd.nist.gov/vuln/detail/CVE-2026-20131

Related News Articles

• Cisco FMC static credentials exploited by attackers (CVE-2026-20316)July 30, 2026
• Cisco says critical Webex Services flaw requires customer actionApril 16, 2026
• Critical Cisco IMC auth bypass gives attackers Admin accessApril 2, 2026
• CISA orders feds to patch max-severity Cisco flaw by SundayMarch 20, 2026
• Ransomware gang exploits Cisco flaw in zero-day attacks since JanuaryMarch 18, 2026

Related Weaknesses

• CWE-502