CVE-2026-20242NVD

Vulnerability Summary

A vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary commands as root on an affected device.

This vulnerability is due to insecure deserialization of a user-supplied Java byte stream from a host that is configured in the external database access list. An attacker could exploit this vulnerability by sending a crafted, serialized Java byte stream to a specific TCP port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges to root.
Notes:

This vulnerability can be exploited only by an attacker who has control of a host in the external database access list.
If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.

Severity Level

CRITICAL(9.8)

Published Date

Sep 16, 2026

Last Modified

Sep 18, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.64%Probability

Root Weakness (CWE)

CWE-502: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.0.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.1.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.2.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.0.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.4
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.5
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.3.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.4
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.4.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.6
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.7
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.5.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.8
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.8.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.6.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.9
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.7
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.8
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.8.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.10.2
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.4
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.3
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.11
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.4
Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.0
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.4
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.5
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.0.9
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.2.11
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.12
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.5
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.6
Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.1
Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.7

Patched Versions

Not provided by cveorg for this CVE.

📧Email Delivery — Threat intel straight to your inbox.

♾️Unlimited Vendors — Track your entire stack.

🚨All New CVEs — Be the first to know.

⚙️Custom EPSS — Filter noise, focus on risk.

💬Webhooks — Slack & Teams integration.

🚫Ad-Free — Uninterrupted experience.