CVE detail
CVE-2026-20131: Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Cisco · Secure Firewall Management Center (FMC)
- Date added (KEV)
- Mar 19, 2026
- CISA due date
- Mar 22, 2026
- Ransomware campaign use
- Known
Required 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.
Vendor fix: Vendor advisory
Scorifya interpretation
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Plain English
Technical detail
From CISA
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.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh ; https://nvd.nist.gov/vuln/detail/CVE-2026-20131
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJhVendor Advisory
- https://aws.amazon.com/blogs/security/amazon-threat-intelligence-teams-identify-interlock-ransomware-campaign-targeting-enterprise-firewalls/Technical Description
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20131US Government Resource
Other recent CVEs from Cisco
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- CVE-2026-20122Catalyst SD-WAN Manger — Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability
- CVE-2026-20128Catalyst SD-WAN Manager — Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability
- CVE-2026-20133Catalyst SD-WAN Manager — Cisco Catalyst SD-WAN Manager Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
- CVE-2022-20775SD-WAN — Cisco SD-WAN Path Traversal Vulnerability
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