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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 13:52 UTC

Microsoft · Internet Key Exchange (IKE) Service Extensions, Windows 10 1607, Windows 10 1809 +11 more

CVE-2026-33824

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

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. 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.

View response plan
CVSS9.8
EPSS77.9%
KEVYes
ExploitationConfirmed exploitation
PatchPatch or guidance available ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 77.9%; technical severity is CVSS 9.8.

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

Who should care

  • Teams operating Internet Key Exchange (IKE) Service Extensions, Windows 10 1607, Windows 10 1809 +11 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Internet Key Exchange (IKE) Service Extensions, Windows 10 1607, Windows 10 1809 +11 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. 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.
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Vendor remediation

Patch and remediation links

Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-415
Affected versions
Microsoft Internet Key Exchange (IKE) Service Extensions; Microsoft Windows 10 1607 (End Excluding: 10.0.14393.9060); Microsoft Windows 10 1809 (End Excluding: 10.0.17763.8644); Microsoft Windows 10 21h2 (End Excluding: 10.0.19044.7184); Microsoft Windows 10 22h2 (End Excluding: 10.0.19045.7184); Microsoft Windows 11 23h2 (End Excluding: 10.0.22631.6936); Microsoft Windows 11 24h2 (End Excluding: 10.0.26100.8246); Microsoft Windows 11 25h2 (End Excluding: 10.0.26200.8246)
Published
14 April 2026
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 77.9%
  4. Signal calculated at 83

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.