CVE-2026-20131

CWE-502 ā€” Deserialization of Untrusted Data9 documents7 sources
10
CVSS
CRITICAL
EPSS0.8%(74th)
CISA KEVRansomware Use
CISA 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HExploitability: 3.9 | Impact: 6.0

Affected Packages1 packages

A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the...
NVD ā†—MITRE ā†—

šŸ”“Vulnerability Details

3
VulDB
Cisco Secure Firewall Management Center up to 10.0.0 Web-based Management Interface deserialization (cisco-sa-fmc-rce-NKhnULJh / EUVD-2026-9444)ā†—2026-03-20
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CVEList
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerabilityā†—2026-03-04
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VulnCheck
Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerabilityā†—2026
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šŸ“‹Vendor Advisories

2
CISA
Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerabilityā†—2026-03-19
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Cisco
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerabilityā†—2026-03-05
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šŸ•µļøThreat Intelligence

2
Bleepingcomputer
CISA orders feds to patch max-severity Cisco flaw by Sundayā†—2026-03-20
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Bleepingcomputer
Ransomware gang exploits Cisco flaw in zero-day attacks since Januaryā†—2026-03-18
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