Description
A vulnerability in the remote diagnostics debugger of Cisco Secure FMC Software could allow an authenticated, remote attacker to enable the remote diagnostics debugger service.

This vulnerability is due to an error when checking the privilege level of a user who is invoking remote diagnostics. An attacker could exploit this vulnerability by authenticating to the device, either through the web-based management interface or the REST API, and using the remote diagnostics debugger to grant a user elevated privileges. A successful exploit could allow the attacker to elevate privileges to root.
Notes:

To exploit this vulnerability, the attacker must have valid user credentials on the affected device.
The CVSSv3.1 Attack Complexity is High due to the multistage process required to fully exploit this vulnerability.
Published: 2026-09-16
Score: 8.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Privilege Escalation to root
Action: Apply Patch
AI Analysis

Impact

The vulnerability involves a flaw in the privilege check for the remote diagnostics debugger in Cisco Secure Firewall Management Center (FMC). An authenticated user can invoke the debugger and misuse the grant mechanism, allowing them to elevate privileges to the system root level. Root privileges enable a user to fully control the device’s configuration, services, and network traffic.

Affected Systems

Cisco Secure Firewall Management Center (FMC). No specific version information is disclosed, but the issue applies to any installation that exposes the remote diagnostics debugger through the web interface or REST API.

Risk and Exploitability

The reported CVSS score is 8.5, indicating high severity. The EPSS score is less than 1%, suggesting a low likelihood of exploitation, and the vulnerability is not listed in the CISA KEV catalogue. Exploitation requires valid credentials and a multi-step process using the web UI or REST API, contributing to high attack complexity. Successful exploitation results in root-level access and full control over the device.

Generated by OpenCVE AI on September 18, 2026 at 01:30 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Restrict administrative and credential access to trusted personnel and enable multi‑factor authentication.
  • Disable the remote diagnostics debugger service on any device where it is not required for operations.
  • Monitor authentication logs for patterns of repeated debugger usage and investigate anomalies.
  • Apply any Cisco‑released firmware or security updates for FMC as soon as they become available.

Generated by OpenCVE AI on September 18, 2026 at 01:30 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Fri, 18 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco secure Firewall Management Center
Vendors & Products Cisco
Cisco secure Firewall Management Center

Fri, 18 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 16 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Description A vulnerability in the remote diagnostics debugger of Cisco Secure FMC Software could allow an authenticated, remote attacker to enable the remote diagnostics debugger service. This vulnerability is due to an error when checking the privilege level of a user who is invoking remote diagnostics. An attacker could exploit this vulnerability by authenticating to the device, either through the web-based management interface or the REST API, and using the remote diagnostics debugger to grant a user elevated privileges. A successful exploit could allow the attacker to elevate privileges to root. Notes: To exploit this vulnerability, the attacker must have valid user credentials on the affected device. The CVSSv3.1 Attack Complexity is High due to the multistage process required to fully exploit this vulnerability.
Title Cisco Secure Firewall Management Center Software Authenticated Privilege Escalation to Root Vulnerability
Weaknesses CWE-264
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Subscriptions

Cisco Secure Firewall Management Center
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-09-17T11:39:22.138Z

Reserved: 2026-08-19T12:02:03.632Z

Link: CVE-2026-76412

cve-icon Vulnrichment

Updated: 2026-09-17T11:31:37.163Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-16T21:17:13.717

Modified: 2026-09-18T13:28:28.567

Link: CVE-2026-76412

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-18T21:45:14Z

Weaknesses