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Cisco zero-day exploited as critical firewall bugs emerge
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Fusion42 · 17 September 2026 · Fusion42 review
A critical zero-day vulnerability in Cisco Identity Services Engine is actively exploited allowing remote attackers full control without credentials, prompting US federal agencies to patch within three days. Additional critical bugs discovered in Cisco Secure Firewall Management Center could allow remote root access though no exploitation is reported yet.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 4 sources have reported it between 17 Sep 2026 and 18 Sep 2026.
◆ ◆ The Wire takeaway
Your network security just got a major threat you must patch within days. If you manage Cisco firewalls or enterprise access control, urgent upgrades are non-negotiable to avoid complete takeover from hackers.
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4 sources · first reported 17 Sep 2026 · latest 18 Sep 2026
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