CVE-2026-20079

CISA Adds Four Actively Exploited Vulnerabilities to KEV Catalog Including Cisco FMC and Fortinet FortiOS

The US Cybersecurity and Infrastructure Security Agency has added four vulnerabilities to its Known Exploited Vulnerabilities catalog, warning that they are being actively exploited in the wild. The flaws affect Cisco Secure Firewall Management Center, Security Cloud Control, Fortinet FortiOS, FortiSwitchManager, and Citrix NetScaler products. One vulnerability allows attackers to bypass authentication and gain root privileges through crafted HTTP requests. Another is a heap-based buffer overflow that enables execution of unauthorized code or commands via specially crafted packets. CISA issued the update on September 9, 2026, urging organizations to apply patches immediately. The agency continues to track these issues as part of its ongoing efforts to mitigate real-world threats.

Cisco Releases Hotfixes for Actively Exploited CVE-2026-20316 Zero-Day in Secure FMC Allowing Static Credential Access

A zero-day vulnerability tracked as CVE-2026-20316 is being actively exploited in Cisco Secure Firewall Management Center, enabling remote attackers to authenticate using hardcoded low-privilege credentials without prior authentication. The flaw carries a CVSS score of 5.3 but has been elevated to High severity by Cisco due to its potential for chaining with other vulnerabilities to achieve privilege escalation. Cisco has issued hotfixes across multiple versions including 7.0, 7.2, 7.4, 7.6, 7.7 and 10.0 while urging administrators to inspect logs for the presence of /var/tmp/license.tmp as an indicator of compromise. The same indicator is also linked to the related critical authentication bypass CVE-2026-20079 that can lead to root access via script execution. Organizations are advised to restrict management interface exposure through ACLs, VPNs and dedicated admin networks, rotate credentials after suspected compromise, and review sudo executions and license-related commands. U.S. federal agencies have a remediation deadline of August 1, 2026 under the Known Exploited Vulnerabilities catalog.