Live › vulnerability › CVE-2026-33824
Go to dashboardDouble free (CWE-415) in the Windows IKEv2 service (IKEEXT), triggered by crafted IKEv2 fragment (SKF) packets sent to UDP 500/4500. Unauthenticated, no user interaction, CVSS 9.8. Patched in April 2026 Patch Tuesday (Apr 14). CISA added it to KEV on Aug 18, 2026. ZDI calls it wormable.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Internet Key Exchange (IKE) Service Extensions | vendor | – | – |
| Windows IKE Service Extensions (IKEEXT) | vendor | all supported Windows 10/11/Server builds below the April 2026 update | 10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836 |
| microsoft windows 10 1607 | vendor | < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft windows 10 1809 | vendor | < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft windows 10 21h2 | vendor | < 10.0.19044.7184 | 10.0.19044.7184 |
| microsoft windows 10 22h2 | vendor | < 10.0.19045.7184 | 10.0.19045.7184 |
| microsoft windows 11 23h2 | vendor | < 10.0.22631.6936 | 10.0.22631.6936 |
| microsoft windows 11 24h2 | vendor | < 10.0.26100.8246 | 10.0.26100.8246 |
| microsoft windows 11 25h2 | vendor | < 10.0.26200.8246 | 10.0.26200.8246 |
| microsoft windows 11 26h1 | vendor | < 10.0.28000.1836 | 10.0.28000.1836 |
| microsoft windows server 2016 | vendor | < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft windows server 2019 | vendor | < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft windows server 2022 | vendor | < 10.0.20348.5020 | 10.0.20348.5020 |
| microsoft windows server 2022 23h2 | vendor | < 10.0.25398.2274 | 10.0.25398.2274 |
| microsoft windows server 2025 | vendor | < 10.0.26100.32690 | 10.0.26100.32690 |
winver or [System.Environment]::OSVersion.Version against the fixed buildsGet-Service IKEEXTGet-NetUDPEndpoint -LocalPort 500,450010.0.14393.9060; Server 2019 10.0.17763.8644; Win10 21H2/22H2 10.0.19044.7184 and 10.0.19045.7184; Win11 23H2 10.0.22631.6936; Win11 24H2/Server 2025 10.0.26100.8246 (MSRC lists 10.0.26100.32690 for Server 2025); Win11 25H2 10.0.26200.8246; Win11 26H1 10.0.28000.1836Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Posts are quoted with a link to the original. They are data to us, never instructions.
Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.
CISA 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.
This page as .md · .json · in your agent: get_signal("CVE-2026-33824")
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