EUVD-2026-22641Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
8DescriptionCVE.org
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthenticated network attackers to execute arbitrary code on Windows 10 (1607-22H2), Windows 11 (22H3-26H1), and Windows Server (2016-2025). CVSS 9.8 critical severity with network vector requiring no authentication or user interaction. Vendor patch released by Microsoft addresses CWE-415 double free weakness. EPSS score of 0.07% (21st percentile) suggests low observed exploitation probability despite critical severity rating, indicating this may be a targeted or difficult-to-exploit vulnerability in production environments. No CISA KEV listing or public POC identified at time of analysis.
Technical ContextAI
Windows IKE Extension implements the Internet Key Exchange protocol used for establishing IPsec VPN tunnels and secure network communications. The vulnerability stems from a double free condition (CWE-415) where memory is deallocated twice, leading to heap corruption that can be leveraged for arbitrary code execution. IKE operates at the network layer handling cryptographic key negotiation, typically over UDP port 500/4500. The affected component spans Windows 10 version 1607 (released 2016) through current Windows 11 26H1 and Windows Server 2025, indicating a long-standing code defect in the IKE implementation. CPE strings identify affected products across consumer (Windows 10/11) and enterprise (Windows Server 2016/2019/2022/2025) editions. Double free vulnerabilities occur when improper error handling or race conditions cause the same memory pointer to be freed multiple times, corrupting heap metadata structures that attackers can manipulate to achieve control flow hijacking.
RemediationAI
Apply Microsoft security updates released in the monthly patch cycle to upgrade Windows to the fixed versions: Windows 10 1607/Server 2016 to build 10.0.14393.9060 or later, Windows 10 1809/Server 2019 to 10.0.17763.8644 or later, Windows 10 21H2 to 10.0.19044.7184 or later, Windows 10 22H2 to 10.0.19045.7184 or later, Windows 11 22H3/23H2 to 10.0.22631.6936 or later, Windows 11 24H2/Server 2025 to 10.0.26100.32690 or later, Windows 11 25H2 to 10.0.26200.8246 or later, Windows 11 26H1 to 10.0.28000.1836 or later, Windows Server 2022 23H2 to 10.0.25398.2274 or later. Download patches from Microsoft Update Catalog or apply via Windows Update, WSUS, or Configuration Manager. If immediate patching is not feasible, implement compensating controls: disable IKE/IPsec services if not required for VPN connectivity (trade-off: breaks IPsec-dependent applications), restrict UDP ports 500 and 4500 at network perimeter firewalls to only trusted VPN gateway IP addresses (trade-off: may block legitimate remote access), or deploy network-based IPS signatures to detect malformed IKE packets (trade-off: potential false positives and throughput impact). Full security advisory and patch download links at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824.
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Same weakness CWE-415 – Double Free
View allSame technique Authentication Bypass
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External POC / Exploit Code
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