CVE-2026-20131CiscoFirewall and VPNMarch 19, 2026

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

Critical 10Actively exploitedUsed by ransomware

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.

What to do

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

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Details

Vendor
Cisco
Product
Cisco Secure Firewall Management Center
CVE
CVE-2026-20131
Affected versions
Cisco Secure Firewall Management Center (FMC) 7.0: 16 versions, from 7.0.0 to 7.0.8.1
Cisco Secure Firewall Management Center (FMC) 7.1: 4 versions, from 7.1.0 to 7.1.0.3
Cisco Secure Firewall Management Center (FMC) 6.4: 6 versions, from 6.4.0.13 to 6.4.0.18
Cisco Secure Firewall Management Center (FMC) 7.2: 19 versions, from 7.2.0 to 7.2.10.2
Cisco Secure Firewall Management Center (FMC) 7.3: 4 versions, from 7.3.0 to 7.3.1.2
Cisco Secure Firewall Management Center (FMC) 7.4: 11 versions, from 7.4.0 to 7.4.5
Cisco Secure Firewall Management Center (FMC) 7.6: 5 versions, from 7.6.0 to 7.6.4
Cisco Secure Firewall Management Center (FMC) 7.7: 4 versions, from 7.7.0 to 7.7.11
Cisco Secure Firewall Management Center (FMC) 10.0: 10.0.0 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
10
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
March 22, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
March 19, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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