Wire · regulatory
Cisco alerts customers to second actively exploited zero-day in as many days
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Fusion42 · 17 September 2026 · Fusion42 review
Cisco disclosed two consecutive actively exploited zero-day vulnerabilities within days, including a critical flaw in Cisco Identity Services Engine which allows remote attackers to bypass authentication and control affected devices. These vulnerabilities pose significant risks due to the product's role in enforcing network policies, prompting urgent patching recommendations.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 4 sources have reported it between 15 Sep 2026 and 17 Sep 2026.
◆ ◆ The Wire takeaway
You face immediate risk if you rely on Cisco Identity Services Engine; urgent patching is essential to protect network control and credentials. Attackers gaining root access here means your whole network policy is vulnerable, pushing defenders to accelerate response.
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4 sources · first reported 15 Sep 2026 · latest 17 Sep 2026
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