CVE-2026-20131 | Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

Exp

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.

Published: 2026-03-04 Last update: 2026-03-25 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20131 is rated Critical Active Threat (93.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.40%). CISA KEV confirms active exploitation (added 2026-03-19) affecting Cisco / Secure Firewall Management Center (FMC). a weakness (CWE-502) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2026-20131

Name: Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability · CISA KEV detail

Exploit added: 2026-03-19

Action due: 2026-03-22

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.

Exploit prediction scoring system (EPSS) score for CVE-2026-20131

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-26 1.14% 1.40% +0.26%
2 2026-05-22 1.72% 1.14% -0.58%
3 2026-05-11 — 1.72% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20131

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]

Weakness enumeration for CVE-2026-20131

Affected software / configurations for CVE-2026-20131

Vendor Product Version Raw CPE
cisco secure_firewall_management_center 6.4.0.13 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.13:*:*:*:*:*:*:*
cisco secure_firewall_management_center 6.4.0.14 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.14:*:*:*:*:*:*:*
cisco secure_firewall_management_center 6.4.0.15 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.15:*:*:*:*:*:*:*
cisco secure_firewall_management_center 6.4.0.16 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.16:*:*:*:*:*:*:*
cisco secure_firewall_management_center 6.4.0.17 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.17:*:*:*:*:*:*:*
cisco secure_firewall_management_center 6.4.0.18 cpe:2.3:a:cisco:secure_firewall_management_center:6.4.0.18:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.0.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.0.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.1.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.1.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.2.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.2.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.4 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.4:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.5 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.5:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.6 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.6.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.6.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.6.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.6.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.7 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.7:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.8 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.8:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.8.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.8.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.1.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.1.0.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.1.0.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.1.0.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.1.0.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.0.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.0.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.3.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.3.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.4 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.4:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.4.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.4.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.5 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.5.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.5.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.5.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.6 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.6:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.7 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.7:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.8 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.8:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.8.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.8.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.9 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.9:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.10 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.10:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.10.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.10.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.2.10.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.2.10.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.3.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.3.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.3.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.3.1.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.3.1.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.3.1.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.1.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.1.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.2.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.2.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.2.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.2.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.2.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.2.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.2.4 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.2.4:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.4 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.4:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.4.5 cpe:2.3:a:cisco:secure_firewall_management_center:7.4.5:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.2 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.2:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.2.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.2.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.3 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.3:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.6.4 cpe:2.3:a:cisco:secure_firewall_management_center:7.6.4:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.7.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.7.0:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.7.10 cpe:2.3:a:cisco:secure_firewall_management_center:7.7.10:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.7.10.1 cpe:2.3:a:cisco:secure_firewall_management_center:7.7.10.1:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.7.11 cpe:2.3:a:cisco:secure_firewall_management_center:7.7.11:*:*:*:*:*:*:*
cisco secure_firewall_management_center 10.0.0 cpe:2.3:a:cisco:secure_firewall_management_center:10.0.0:*:*:*:*:*:*:*

References for CVE-2026-20131

cvelogic Threat Intelligence