CVE-2026-33824
CriticalExploitedPublic exploitWindows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
Published Apr 14, 2026 · Updated Oct 15, 2026
Key Facts
Patch immediately- CVE-2026-33824 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft), windows 10 21H2 (Microsoft) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 30, 2026. Public exploit code is available.
- EPSS estimates a 1.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1607 10.0.14393.9060, Windows 10 1809 10.0.17763.8644, windows 10 21H2 10.0.19044.7184.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.6%
Higher than 75.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-33824 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 18, 2026 | Aug 21, 2026 | Not reported |
| Industry KEV feed | Jul 30, 2026 | Aug 21, 2026 | Not reported |
| CIRCL KEV | Aug 18, 2026 | Aug 21, 2026 | Not reported |
| ENISA EUVD | Aug 18, 2026 | n/a | Not reported |
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.
Affected Products
72 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1607Microsoft | 10.0.14393.9060 | 10.0.14393.9060 |
| Windows 10 1809Microsoft | 10.0.17763.8644 | 10.0.17763.8644 |
| windows 10 21H2Microsoft | 10.0.19044.7184 | 10.0.19044.7184 |
| windows 10 22H2Microsoft | 10.0.19045.7184 | 10.0.19045.7184 |
| windows 11 23H2Microsoft | 10.0.22631.6936 | 10.0.22631.6936 |
Patched Releases
Windows 10 1607
10.0.14393.9060
Windows 10 1809
10.0.17763.8644
windows 10 21H2
10.0.19044.7184
windows 10 22H2
10.0.19045.7184
windows 11 23H2
10.0.22631.6936
windows 11 24H2
10.0.26100.8246
windows 11 25H2
10.0.26200.8246
windows 11 26H1
10.0.28000.1836
Windows Server 2016
10.0.14393.9060
Windows Server 2019
10.0.17763.8644
Windows Server 2022
10.0.20348.5020
Windows Server 2022 23h2
10.0.25398.2274
Windows Server 2025
10.0.26100.32690
Windows Server 23h2
10.0.25398.2274
Windows 10 Version 1607
10.0.14393.9060
Windows 10 Version 1809
10.0.17763.8644
Windows 10 Version 21H2
10.0.19044.7184
Windows 10 Version 22H2
10.0.19045.7184
Windows 11 version 22H3
10.0.22631.6936
Windows 11 version 23H2
10.0.22631.6936
Windows 11 Version 24H2
10.0.26100.8246
Windows 11 Version 25H2
10.0.26200.8246
Windows 11 version 26H1
10.0.28000.1836
Windows Server 2016 (Server Core installation)
10.0.14393.9060
Windows Server 2019 (Server Core installation)
10.0.17763.8644
Timeline
Publicly disclosed
Apr 14, 2026
Added to Industry KEV feed
Jul 30, 2026
Added to CISA KEV
Aug 18, 2026
Added to CIRCL KEV
Aug 18, 2026
Added to ENISA EUVD
Aug 18, 2026
Last updated
Oct 15, 2026
Weakness Type
- CWE-415 Double Free
References
- advisoryWindows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Affected: Windows 10 1607 (Microsoft) versions 10.0.14393.9060; Windows 10 1809 (Microsoft) versions 10.0.17763.8644; windows 10 21H2 (Microsoft) versions 10.0.19044.7184, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 30, 2026.
Yes. It was added on Aug 18, 2026 with a federal remediation due date of Aug 21, 2026.
Public exploit code is available.
Fixed versions are available, including Windows 10 1607 10.0.14393.9060, Windows 10 1809 10.0.17763.8644, windows 10 21H2 10.0.19044.7184.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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