Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-08-18
• Critical severity: CVSS 9.8

[ Description ]Official description

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

CISA: Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 21 Aug 2026): 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.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824Vendor Advisory
• unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaignThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource