CVE-2026-20316
Modified Modified - Updated After Analysis

Authentication Bypass in Cisco Secure Firewall Management Center

Publication date: 2026-07-29

Last updated on: 2026-07-30

Assigner: Cisco Systems, Inc.

Description
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems. This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user.  Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.   Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.

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Meta Information

Published
2026-07-29
Last Modified
2026-07-30
Generated
2026-07-30
AI Q&A
2026-07-30
EPSS Evaluated
N/A
NVD
CVE-2026-20316

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
cisco secure_firewall_management_center From 7.3.0 (inc) to 7.3.1.2 (inc)
cisco secure_firewall_management_center From 7.0.0 (inc) to 7.0.9 (inc)
cisco secure_firewall_management_center From 7.2.0 (inc) to 7.2.11 (inc)
cisco secure_firewall_management_center From 7.4.0 (inc) to 7.4.7 (inc)
cisco secure_firewall_management_center From 10.0.0 (inc) to 10.0.1 (inc)
cisco secure_firewall_management_center From 7.6.0 (inc) to 7.6.5 (inc)
cisco secure_firewall_management_center From 7.7.0 (inc) to 7.7.12 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-259 The product contains a hard-coded password, which it uses for its own inbound authentication or for outbound communication to external components.

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Executive Summary

CVE-2026-20316 is a vulnerability in Cisco Secure Firewall Management Center (FMC) Software that allows an unauthenticated remote attacker to log in using static credentials for a low-privileged account. This grants access to sensitive data within the system. The vulnerability exists due to these static credentials being present in the software.

Detection Guidance

Check for the specific log message in the output of the command 'cat /var/log/messages | grep license' that includes '/var/tmp/license.tmp'. This may indicate exploitation of the vulnerability.

Impact Analysis

An attacker could exploit this to log in as a low-privileged user and access sensitive data. If combined with other vulnerabilities, it could also help elevate privileges. The attack surface is smaller if the FMC management interface is not exposed to the public internet.

Mitigation Strategies

Upgrade to the fixed software releases provided by Cisco. If exploitation is suspected, rotate all user credentials, keys, and certificates on the affected device and contact Cisco Technical Assistance Center (TAC).

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