Critical 10.0Known exploited (CISA KEV)Published Mar 4, 2026

CVE-2026-20079Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

Updated under an hour ago (2026-10-19 04:50 UTC)

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It affects Cisco Secure Firewall Management Center (FMC) and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Sep 9, 2026; federal agencies had to remediate by Sep 12, 2026. Treat that date as your deadline.

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Every CVE for Cisco Secure Firewall Management Center (FMC)

Exploited in the last 30 days

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: 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-288
Known exploited: Added to CISA KEV Sep 9, 2026; federal remediation due Sep 12, 2026Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
EPSS (exploitation in the next 30 days): 88.18% (percentile 100)
Assigned by: cisco
NVD analysis: Analyzed
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cisco Cisco Secure Firewall Management Center (FMC) cisco:secure_firewall_management_center_fmc (from the name)	7.0.0; 7.0.0.1; 7.0.1; 7.1.0; 7.0.1.1; 7.1.0.1; 7.0.2; 7.2.0; and 64 more ranges	CNA record
cisco secure_firewall_management_center cisco:secure_firewall_management_center	7.0.0; 7.0.0.1; 7.0.1; 7.0.1.1; 7.0.2; 7.0.2.1; 7.0.3; 7.0.4; and 64 more ranges	NVD

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2vendor-advisory
http://seclists.org/fulldisclosure/2026/Aug/80exploit, mailing-list, third-party-advisory
https://blog.talosintelligence.com/fmc-ongoing-exploitation/exploit, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.