Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability

Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management

Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system. Added to CISA KEV on 2026-09-09 (federal deadline 2026-09-12).

First seen: 9 Sept 2026
Last update: 9 Sept 2026, 12:00 UTC
Identifiers: CVE-2026-20079
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management
Ids: CVE-2026-20079

Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system. Added to CISA KEV on 2026-09-09 (federal deadline 2026-09-12).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-20079") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2026-20079 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2
https://pwned.coffee/i/cisco-firewall-management-center-authentication-bypass-u-cve-2026-20079

Sources

Totalone hot coffee