Vulnerability Intelligence Report
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
CVE-2026-20131
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 attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
CISA KEV
SSVC: Active Exploitation
Automatable
Deserialization
CVSS Base Score
10.0
CRITICAL
Exploitability:3.9
Impact Score:6.1
EPSS Probability:31.23%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-502 ↗Deserialization of Untrusted Data
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.0 (affected), 7.0.0.1 (affected), 7.0.1 (affected), 7.1.0 (affected), 6.4.0.13 (affected), 7.0.1.1 (affected), 6.4.0.14 (affected), 7.1.0.1 (affected), 7.0.2 (affected), 6.4.0.15 (affected), 7.2.0 (affected), 7.0.2.1 (affected), 7.0.3 (affected), 7.1.0.2 (affected), 7.2.0.1 (affected), 7.0.4 (affected), 7.2.1 (affected), 7.0.5 (affected), 6.4.0.16 (affected), 7.3.0 (affected), 7.2.2 (affected), 7.3.1 (affected), 7.2.3 (affected), 7.1.0.3 (affected), 7.2.3.1 (affected), 7.2.4 (affected), 7.0.6 (affected), 7.2.4.1 (affected), 7.2.5 (affected), 7.3.1.1 (affected), 7.4.0 (affected), 6.4.0.17 (affected), 7.0.6.1 (affected), 7.2.5.1 (affected), 7.4.1 (affected), 7.2.6 (affected), 7.4.1.1 (affected), 7.0.6.2 (affected), 6.4.0.18 (affected), 7.2.7 (affected), 7.2.5.2 (affected), 7.3.1.2 (affected), 7.2.8 (affected), 7.6.0 (affected), 7.4.2 (affected), 7.2.8.1 (affected), 7.0.6.3 (affected), 7.4.2.1 (affected), 7.2.9 (affected), 7.0.7 (affected), 7.7.0 (affected), 7.4.2.2 (affected), 7.2.10 (affected), 7.6.1 (affected), 7.4.2.3 (affected), 7.0.8 (affected), 7.6.2 (affected), 7.7.10 (affected), 7.2.10.1 (affected), 7.0.8.1 (affected), 7.6.2.1 (affected), 7.2.10.2 (affected), 7.7.10.1 (affected), 7.4.2.4 (affected), 7.4.3 (affected), 7.7.11 (affected), 7.6.4 (affected), 10.0.0 (affected), 7.4.4 (affected), 7.4.5 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
EPSS Score
31.231%
GitHub Advisory
Vulnerability Class
Deserialization
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2025-10-08T11:59:15 |
| Published | 2026-03-04T17:17:56 |
| Last Updated | 2026-08-14T03:55:24 |
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