Cisco Catalyst Center Arbitrary File Read Vulnerability (CVE-2026-20191): What Organizations Need to Know

Cisco has disclosed CVE-2026-20191, a high-severity vulnerability affecting Cisco Catalyst Center (formerly Cisco DNA Center). The vulnerability allows a remote, unauthenticated attacker to read files from restricted areas of the affected system through a specially crafted HTTP request.

With a CVSS score of 7.5 (High), this vulnerability poses a significant risk to organizations that rely on Cisco Catalyst Center for network management and automation. Successful exploitation could expose sensitive configuration data, application information, and potentially credentials stored within the platform.

What Is CVE-2026-20191?

CVE-2026-20191 is an arbitrary file read vulnerability caused by insufficient validation of user-supplied input within Cisco Catalyst Center.

The vulnerability is classified as a Path Traversal (CWE-22) issue, allowing an attacker to access files outside the intended directory structure.

Key Characteristics

• Remote exploitation
• No authentication required
• No user interaction required
• Low attack complexity
• High confidentiality impact

The vulnerability affects the confidentiality of information stored within the platform but does not directly impact system integrity or availability.

Why Is This Vulnerability Important?

Cisco Catalyst Center serves as a central management platform for enterprise networks, providing visibility, automation, assurance, and policy management capabilities.

Because the platform often contains sensitive operational information, a successful attack could expose:

• Network topology information
• Device configurations
• Application configuration files
• Internal service information
• Administrative settings
• Potentially sensitive operational data

For attackers, access to such information can facilitate reconnaissance activities and support follow-on attacks against critical infrastructure.

Technical Overview

The vulnerability exists because the application does not properly restrict access to file paths requested through certain HTTP requests.

An attacker can send specially crafted requests designed to traverse directory structures and retrieve files that should normally remain inaccessible.

Attack Scenario

1. An attacker identifies a reachable Cisco Catalyst Center instance.
2. The attacker sends a crafted HTTP request.
3. The application improperly processes the file path.
4. Restricted files are returned to the attacker.
5. Sensitive information may be disclosed.

Because the attack does not require valid credentials, organizations should consider exposed management interfaces to be at elevated risk until remediation has been completed.

Affected Products

Cisco has indicated that the vulnerability affects specific Cisco Catalyst Center software releases.

Organizations should verify whether they are running:

• Cisco Catalyst Center Hardware Appliance
• Cisco Catalyst Center Virtual Appliance
• Cisco Catalyst Center Global Manager

Affected deployment types should be compared against Cisco's official software advisory to determine exposure.

CVSS Severity Breakdown

Metric	Value
CVSS Version	3.1
Base Score	7.5
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Confidentiality Impact	High
Integrity Impact	None
Availability Impact	None

Mitigation and Remediation

Cisco has stated that there are no workarounds that fully address this vulnerability.

Recommended Actions

1. Identify all Cisco Catalyst Center deployments.
2. Determine the exact software version in use.
3. Review the Cisco advisory for affected releases.
4. Upgrade to the first fixed release recommended by Cisco.
5. Validate successful installation of security updates.
6. Monitor systems for unusual activity following remediation.

Additional Security Best Practices

Although not a replacement for patching, organizations should also:

• Restrict management access to trusted networks.
• Prevent direct Internet exposure of management platforms.
• Implement multi-factor authentication for administrative access.
• Enable centralized logging and monitoring.
• Regularly review access control policies.

Frequently Asked Questions (FAQ)

What is CVE-2026-20191?

CVE-2026-20191 is a high-severity arbitrary file read vulnerability affecting Cisco Catalyst Center that can allow unauthenticated attackers to access restricted files.

Does exploitation require authentication?

No. The vulnerability can be exploited without valid credentials.

Is user interaction required?

No. The attack can occur without any action from users or administrators.

What is the CVSS score?

Cisco assigned a CVSS v3.1 score of 7.5 (High).

Are there workarounds?

Cisco has indicated that no workaround fully mitigates the vulnerability. Upgrading to a fixed software release is the recommended solution.

What data could be exposed?

Potentially exposed information may include configuration files, operational data, application settings, and other files stored within the Cisco Catalyst Center environment.

Conclusion

CVE-2026-20191 highlights the importance of maintaining current software versions on critical network management platforms. Because the vulnerability is remotely exploitable without authentication and can expose sensitive information, organizations should prioritize verification of affected systems and implement Cisco's recommended updates as soon as operationally feasible.

Early identification, controlled access to management interfaces, and prompt patching remain the most effective strategies for reducing risk associated with this vulnerability.

Keywords: Cisco Catalyst Center Vulnerability, CVE-2026-20191, Arbitrary File Read, Path Traversal, Cisco Security Advisory, Network Security, Cisco DNA Center Security, CVSS 7.5, Cisco Vulnerability Management, Enterprise Network Security.