Exploited vulnerability CISA KEV
CVE-2026-20079: Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
CVE-2026-20079 is a vulnerability in Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
CVE-2026-20079 is a vulnerability in Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management that CISA added to its Known Exploited Vulnerabilities catalog on September 9, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 12, 2026.
- CVE ID
- CVE-2026-20079
- Vendor / project
- Cisco
- Product
- Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management
- Added to KEV
- Due date
- Days to remediate
- 3
- Known ransomware use
- Unknown
- Weakness
- CWE-288
CISA description #
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.
Required action #
Apply 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.
Notes and references #
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20079
This page reproduces CISA’s catalog entry and is not indexed by search engines until an editor adds analysis. [Editorial analysis pending]