CVEs / CVE-2026-33824
CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
- Known exploited in the CISA KEV catalog since 18 Aug 2026
- critical 9.8 CVSS 3.1 (from the CNA)
- EPSS 77% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.
Description
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1607 | from 10.0.14393.0, before 10.0.14393.9060 | 10.0.14393.9060 |
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before 10.0.17763.8644 | 10.0.17763.8644 |
| Microsoft Windows 10 Version 21H2 | from 10.0.19044.0, before 10.0.19044.7184 | 10.0.19044.7184 |
| Microsoft Windows 10 Version 22H2 | from 10.0.19045.0, before 10.0.19045.7184 | 10.0.19045.7184 |
| Microsoft Windows 11 version 23H2 | from 10.0.22631.0, before 10.0.22631.6936 | 10.0.22631.6936 |
| Microsoft Windows 11 Version 23H2 | from 10.0.22631.0, before 10.0.22631.6936 | 10.0.22631.6936 |
| Microsoft Windows 11 Version 24H2 | from 10.0.26100.0, before 10.0.26100.8246 | 10.0.26100.8246 |
| Microsoft Windows 11 Version 25H2 | from 10.0.26200.0, before 10.0.26200.8246 | 10.0.26200.8246 |
| Microsoft Windows 11 version 26H1 | from 10.0.28000.0, before 10.0.28000.1836 | 10.0.28000.1836 |
| Microsoft Windows Server 2016 | from 10.0.14393.0, before 10.0.14393.9060 | 10.0.14393.9060 |
| Microsoft Windows Server 2016 (Server Core installation) | from 10.0.14393.0, before 10.0.14393.9060 | 10.0.14393.9060 |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before 10.0.17763.8644 | 10.0.17763.8644 |
| Microsoft Windows Server 2019 (Server Core installation) | from 10.0.17763.0, before 10.0.17763.8644 | 10.0.17763.8644 |
| Microsoft Windows Server 2022 | from 10.0.20348.0, before 10.0.20348.5020 | 10.0.20348.5020 |
| Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) | from 10.0.25398.0, before 10.0.25398.2274 | 10.0.25398.2274 |
| Microsoft Windows Server 2025 | from 10.0.26100.0, before 10.0.26100.32690 | 10.0.26100.32690 |
| Microsoft Windows Server 2025 (Server Core installation) | from 10.0.26100.0, before 10.0.26100.32690 | 10.0.26100.32690 |
Exploitation
| In CISA KEV since | 18 Aug 2026 |
|---|---|
| Due date for US federal agencies | 21 Aug 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | 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. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-415 |
References
- CVE-2026-33824 on NVD
- CVE-2026-33824 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-33824 (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824 Vendor Advisory
- https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/ Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.