External risk intelligence

Cisco FMC Static Credentials Allow Low-Privilege Access

CVE advisoryKnown Exploit

CVE-2026-20316

The vulnerability affects the management interface of the Cisco Secure Firewall Management Center. While these interfaces are typically intended for internal administrative access and should be shielded from the public internet, they are frequently deployed in ways that could make them reachable from the internet, particularly in distributed enterprise environments or when misconfigured.

Cisco Secure Firewall Management Center

7.0.0 to 7.0.97.2.0 to 7.2.117.3.0 to 7.3.1.27.4.0 to 7.4.77.6.0 to 7.6.57.7.0 to 7.7.1210.0.0 to 10.0.1

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in the web interface of Cisco Secure Firewall Management Center software. This issue, stemming from the use of static credentials for a low-privileged account, could allow an unauthorized remote attacker to gain access and retrieve sensitive information from affected systems. Cisco has flagged this with a high security impact, noting its potential to be combined with other vulnerabilities for privilege escalation.

Low-privileged account credentials are exposed.
Could allow unauthorized access to sensitive data.
Confirm relevance and assess exposure to sensitive data.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker could remotely access a Cisco Secure Firewall Management Center's web interface, likely starting from the internet if the interface is exposed. This access allows them to use hard-coded, low-privileged credentials to log in and retrieve sensitive data from the system. If the management interface is not publicly accessible, the risk is reduced.

Unauthenticated remote entry required.
Static low-privilege credentials used.
Sensitive data access risk.

Live Threat

Current exploitation, exposure, and threat context

An unauthenticated attacker could leverage static credentials to log into a Cisco Secure Firewall Management Center with a low-privileged account. This could expose sensitive system data if the management interface is accessible from the internet. The advisory notes this vulnerability can be combined with others to elevate privileges.

System data at risk.
Access via network, if exposed.
Sensitive data access possible.

Operational Fix

Recommended remediation, mitigation, and detection steps

In real-world scenarios, the platform or infrastructure teams responsible for managing Cisco Secure Firewall Management Center (FMC) deployments would likely own this vulnerability. Initial actions should focus on inventorying all FMC instances, assessing their internet accessibility, and identifying the specific business-critical systems and their accountable owners. This foundational understanding is crucial for prioritizing remediation efforts and coordinating with the vendor if necessary.

Platform/Infrastructure teams own the issue.
Verify FMC internet reachability and asset criticality.
Plan remediation based on identified risks.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is Cisco Secure Firewall Management Center?

It is a centralized administrative platform used to manage and monitor various Cisco firewall devices within a network. Organizations rely on this software to orchestrate security policies and oversee traffic across their distributed environments.

What does CWE-259 mean for CVE-2026-20316?

This classification refers to the use of hard-coded passwords. In the context of this CVE, it means the software contains static, low-privileged credentials that are not meant to be publicly known. An attacker can leverage these specific, pre-set credentials to bypass authentication and gain initial entry into the management interface.

How can an attacker trigger this vulnerability?

An attacker triggers this by reaching the web interface of an affected system and successfully logging in using the hard-coded credentials. The vulnerability does not trigger if the management interface is physically or logically isolated from the network path used by the attacker, such as when the interface is kept entirely off the public internet.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal notes that while management interfaces are typically meant for internal use, they are often reachable from the internet due to configuration choices or enterprise design. If your specific deployment allows internet-based access to the FMC web interface, your system is considered exposed and at higher risk of being targeted.

What should I do first to address this issue?

Begin by creating a complete inventory of your Cisco Secure Firewall Management Center instances. Once identified, verify which systems have management interfaces accessible from the internet and prioritize those for immediate protection. Coordinate with your infrastructure or platform teams to ensure you follow the official vendor remediation instructions as they become available.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.