Amazon Reports Exploitation of Cisco ISE and Citrix NetScaler Zero-Days

Amazon Reports Exploitation of Cisco ISE and Citrix NetScaler Zero-Days

First seen 2 Dec 2025, 18:33 UTC •ThehackernewsYahooSecurityaffairs.CoFeeds.Feedburner •81% similarity •8.6

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Amazon has identified an advanced threat actor exploiting zero-day vulnerabilities in Cisco Identity Service Engine (ISE) and Citrix NetScaler. The attackers utilized CVE-2025-20337 and CVE-2025-5777 to deploy custom malware, taking advantage of multiple undisclosed vulnerabilities as well. This incident highlights the ongoing risks associated with unpatched software in critical infrastructure.

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Amazon Citrix Cisco ISE Citrix NetScaler ADC