Critical Windows IKE Extension RCE Flaw CVE-2026-33824 Actively Exploited

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A critical remote code execution vulnerability, CVE-2026-33824, in the Windows IKE Extension is now being actively exploited in the wild, according to BleepingComputer and confirmed by CISA and Microsoft. Attackers can exploit the flaw by sending specially crafted IKEv2 packets to UDP ports 500 or 4500, requiring no authentication or user interaction. Successful exploitation triggers a double-free memory corruption in the IKEEXT service, granting attackers SYSTEM-level privileges on unpatched Windows machines. Once compromised, attackers can install malware, steal credentials, and move laterally across networks. Microsoft urges administrators to apply patches released in April 2026 or later and to block UDP ports 500 and 4500 on systems that do not require IKE functionality.

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