Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
What happened
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
CISA lists it as exploited, added 18 Aug 2026.
Does it affect you
Names Microsoft Windows Server. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
msrc.microsoft.com - 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.gov
CISA’s notes for this entry:
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-33824
- BOD 26-04: cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov/vuln/detail/CVE-2026-33824
Affected, as published to NVD
- ms-winserver
- Microsoft Windows Server: everything below 10.0.14393.9060
The record
- NVD status
- Analyzed
- Published
- 14 Apr 2026, last modified 25 Sep 2026 (NVD)
- Severity
- CVSS 3.1 base score 9.8, Critical — computed here from the vector; NVD states 9.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-415 Double Free (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 18 Aug 2026; federal remediation due 21 Aug 2026. CISA entry
- Exploit probability
- EPSS 1.6%, 76th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Microsoft · Internet Key Exchange (IKE) Service Extensions (CISA)
References on the NVD record
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824Vendor Advisory
- unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824US Government Resource
Reporting that names this identifier
- CISA Adds Four Known Exploited Vulnerabilities to Catalog — CISA, 2 mo ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.