Risk Letters

Exploited vulnerability

CVE-2026-20079

TLP:CLEAR

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

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.

Facts

  • Vendor: Cisco
  • Product: Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management
  • CVSS: 10
  • EPSS (probability of exploitation within 30 days): 88.7 %
  • On CISA's Known Exploited Vulnerabilities list since: 9 September 2026
  • First known exploitation: 9 September 2026
  • CISA's deadline for US federal agencies: 12 September 2026
  • Weakness: CWE-288
  • First seen by Risk Letters: 9 September 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD