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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.

Security NEXTTranslated from Japanese

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The US Cybersecurity and Infrastructure Security Agency (CISA) has added four vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild.

One of the flaws, CVE-2026-20079, impacts Cisco Secure Firewall Management Center (FMC) and the cloud-based Security Cloud Control (SCC) service. Attackers can bypass authentication and obtain root privileges by sending a crafted HTTP request. The issue was publicly disclosed on March 4, 2026.

Another vulnerability, CVE-2025-25249, affects Fortinet products including FortiOS and FortiSwitchManager. It is a heap-based buffer overflow that allows execution of unauthorized code or commands through crafted packets. Fortinet published a security advisory in January 2026.

The remaining two vulnerabilities also involve Citrix NetScaler and additional Cisco firewall management products, according to the CISA alert issued on September 9, 2026.

Organizations are strongly advised to review the official CISA KEV catalog and apply available patches without delay to prevent further exploitation.

CISAFortinetFortiOSCVE-2026-20079CiscoNetScalerCVE-2025-25249
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