CVE-2026-33824MicrosoftOperating systemsAugust 18, 2026

Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

Critical 9.8Actively exploited

Description

Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.

What to do

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.

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Details

Vendor
Microsoft
Product
Microsoft IKE Service Extensions
CVE
CVE-2026-33824
Affected versions
Windows 10 Version 1607 10.0: from 10.0.14393.0 to 10.0.14393.9060 (excluded) — fixed in 10.0.14393.9060
Windows 10 Version 1809 10.0: from 10.0.17763.0 to 10.0.17763.8644 (excluded) — fixed in 10.0.17763.8644
Windows 10 Version 21H2 10.0: from 10.0.19044.0 to 10.0.19044.7184 (excluded) — fixed in 10.0.19044.7184
Windows 10 Version 22H2 10.0: from 10.0.19045.0 to 10.0.19045.7184 (excluded) — fixed in 10.0.19045.7184
Windows 11 version 23H2 10.0: from 10.0.22631.0 to 10.0.22631.6936 (excluded) — fixed in 10.0.22631.6936
Windows 11 Version 23H2 10.0: from 10.0.22631.0 to 10.0.22631.6936 (excluded) — fixed in 10.0.22631.6936
Windows 11 Version 24H2 10.0: from 10.0.26100.0 to 10.0.26100.8246 (excluded) — fixed in 10.0.26100.8246
Windows 11 Version 25H2 10.0: from 10.0.26200.0 to 10.0.26200.8246 (excluded) — fixed in 10.0.26200.8246
Windows 11 version 26H1 10.0: from 10.0.28000.0 to 10.0.28000.1836 (excluded) — fixed in 10.0.28000.1836
Windows Server 2016 10.0: from 10.0.14393.0 to 10.0.14393.9060 (excluded) — fixed in 10.0.14393.9060
Windows Server 2016 (Server Core installation) 10.0: from 10.0.14393.0 to 10.0.14393.9060 (excluded) — fixed in 10.0.14393.9060
Windows Server 2019 10.0: from 10.0.17763.0 to 10.0.17763.8644 (excluded) — fixed in 10.0.17763.8644
Windows Server 2019 (Server Core installation) 10.0: from 10.0.17763.0 to 10.0.17763.8644 (excluded) — fixed in 10.0.17763.8644
Windows Server 2022 10.0: from 10.0.20348.0 to 10.0.20348.5020 (excluded) — fixed in 10.0.20348.5020
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0: from 10.0.25398.0 to 10.0.25398.2274 (excluded) — fixed in 10.0.25398.2274
Windows Server 2025 10.0: from 10.0.26100.0 to 10.0.26100.32690 (excluded) — fixed in 10.0.26100.32690
Windows Server 2025 (Server Core installation) 10.0: from 10.0.26100.0 to 10.0.26100.32690 (excluded) — fixed in 10.0.26100.32690 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
9.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
August 21, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
August 18, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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