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CVE-2026-20079

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

10.0 CRITICALActively exploited (CISA KEV)Public exploitEPSS 88.2%
  1. Published4 Mar 2026
  2. Added to CISA KEV9 Sept 2026
  3. Remediation due12 Sept 2026
Actively exploited (CISA KEV)

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 KEV: 9 Sept 2026Federal remediation due: 12 Sept 2026

Description

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software 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.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Cisco Secure Firewall Management Center10.0.0 · 10.0.1 · 7.0.0 · 7.0.0.1

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-20079 being actively exploited?

Yes. CVE-2026-20079 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 9 Sept 2026.

How severe is CVE-2026-20079?

CVE-2026-20079 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 88.2% probability of exploitation.

Which products are affected by CVE-2026-20079?

Affected products include Cisco Secure Firewall Management Center.

How do I fix CVE-2026-20079?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-20079 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.