CVE-2026-33824criticalunder attackCWE-415

CVE-2026-33824: critical vulnerability in Microsoft Windows 10 Version 1607

Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability

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100Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a public proof of concept.

ssvc Actcvss 9.8epss 77%
from disclosure to weapon34 days
Published on NVDApr 14
1st PoC+34d
CISA KEV+126d
Official alert in Brazil

Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.

  • CISC Gov.br · 25 Aug 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
  • CTIR Gov · ALERTA 68/2026 · 19 Aug 2026Vulnerabilidade crítica no Key Exchange (Microsoft)read on gov.br ↗
Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Action required by CISAfederal deadline: 2026-08-21

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

In short

A flaw in Windows Internet Key Exchange (IKE) Service Extensions allows an attacker to crash the system or run malicious code remotely without needing any credentials. This happens because the same memory location is freed twice, causing instability that can be exploited.

Technical detail

Double free vulnerability (CWE-415) in Windows IKE Extensions permits remote code execution via network-based attack without authentication. The memory corruption arising from duplicate deallocation enables arbitrary code execution with the privileges of the IKE service, affecting confidentiality, integrity, and availability.

Summary generated and translated by AI from the official description.
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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