---
title: "CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-33824/
description: "CVE-2026-33824 (Microsoft Internet Key Exchange (IKE) Service Extensions): Exploited in the wild (CISA KEV). Double free in Windows IKE Extension allows an…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-14
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-33824"
kev: true
cvss: 9.8
epss: 0.01619
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Internet Key Exchange (IKE) Service Extensions. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-08-18, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-08-21 ; treat that as the outer limit, not the target.
- EPSS 1.6% , percentile 76: FIRST’s model estimates a 1.6% chance of exploitation activity in the next 30 days, higher than 76% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Check exposure. Windows IKE CVE-2026-33824: Exploited Pre-Auth RCE — The fix shipped in April, so most fleets are already covered; the real risk is any unpatched Windows host that answers IKE on UDP 500 or 4500 from untrusted networks, and those need patching or blocking today.

## What it is

Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.

## Affected products (CVE record)

- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9060
- Microsoft Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.8644
- Microsoft Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7184
- Microsoft Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7184
- Microsoft Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.6936
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.6936
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.8246
- Microsoft Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.8246
- Microsoft Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.1836
- Microsoft Windows Server 2016: 10.0.14393.0 < 10.0.14393.9060

## Severity

- microsoft CVSS 3.1: 9.8 `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`

## Exploitation

- CISA KEV: added 2026-08-18; federal due date 2026-08-21. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.62% probability of exploitation activity in the next 30 days; percentile 76.

## Sources

- [Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824)
- [Listed in CISA KEV notes (msrc.microsoft.com)](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-33824)
- [CVE.org record CVE-2026-33824](https://www.cve.org/CVERecord?id=CVE-2026-33824)
- [NVD entry CVE-2026-33824](https://nvd.nist.gov/vuln/detail/CVE-2026-33824)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [unit42.paloaltonetworks.com](https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/)

---
Source page: https://erroneo.us/security/cve/CVE-2026-33824/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt