CVE-2026-20131

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

CISA KEV · in the CISA KEV catalog since 2026-03-19

What EVULNABLE says

EVULNABLE Risk · priority 85/100 Immediate Raised to the floor for a confirmed exploited vulnerability. Intelligence coverage 75/90 — no pre-patch disclosure data
ExigentOverdue by 5 monthsRansomwareCISA KEVActively Exploited

Why it matters: Listed in the CISA KEV catalog, and Confirmed exploitation in the wild.

Out-of-Band / Urgent Remediation

The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.

The evidence behind it

Published measurements for CVE-2026-20131
MeasureValueSource
CVSS base score 10.0 NVD
FIRST EPSS 0.312 (98.1st pctl) FIRST
Actively exploited Confirmed CISA KEV
Ransomware campaign use Known CISA KEV
CISA remediation deadline 2026-03-22 — Overdue by 5 months CISA KEV
Intelligence coverage 75/90 — no pre-patch disclosure data

What CISA says to do

This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.

NVD ↗ CISA KEV ↗ Vendor Advisory ↗