CVE-2026-20131

UNKNOWNKnown Exploited

CISA Known Exploited Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh ; https://nvd.nist.gov/vuln/detail/CVE-2026-20131

Remediation deadline: March 22, 2026

Ransomware use: Known

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.

Timeline

Published:March 19th, 2026 12:00 AM

Last modified:March 19th, 2026 12:00 AM

Added to KEV:March 19th, 2026

CVSS Scoring

No CVSS v3 score available

Affected Software

From NVD CPE configuration data

Vendors

Cisco

Products

Secure Firewall Management Center (FMC)

Weaknesses (CWE)

CWE-502

References & Reports

Advisories, patches, and third-party reports

No references available.

Source: CISA KEV + NVD · Data may lag official sources by up to one minute