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CVE-2026-33824

CRITICAL 9.8 KNOWN EXPLOITED ALL-YEARS

Published 2026-04-14 · Last modified 2026-10-15 · microsoft · NVD: Analyzed

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

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-08-18. Patch or mitigate now.

Exploitation likelihood

77.1%chance of exploitation in 30 days · 100th percentile

● In CISA KEV (2026-08-18)○ Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

9.8CVSS 3.1 · CRITICAL · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Microsoft

Products Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21h2 Windows 10 Version 22h2 Windows 11 Version 23h2 Windows 11 Version 24h2 Windows 11 Version 25h2 Windows 11 Version 26h1 Windows Server 2016 Windows Server 2016 (Server Core Installation) Windows Server 2019 Windows Server 2019 (Server Core Installation) Windows Server 2022 Windows Server 2022, 23h2 Edition (Server Core Installation) Windows Server 2025 Windows Server 2025 (Server Core Installation) Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2022 23h2

Weakness (CWE)

  • CWE-415: : Double Free

CVSS vector

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

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

2 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-07-30T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-33824 · Updated 2026-07-30T00:00:00Z
  • VulnCheck KEV · 2026-07-30T00:00:00ZVulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-08-07T00:00:00ZVulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-08-14T00:00:00ZVulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-08-18T00:00:00ZVulnCheck KEV · CVE-2026-33824
    VulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-08-20T00:00:00ZVulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-09-03T00:00:00ZVulnCheck KEV · CVE-2026-33824
  • VulnCheck KEV · 2026-09-08T00:00:00ZVulnCheck KEV · CVE-2026-33824

Known Affected Software Configurations

VendorProductVersion range
MicrosoftWindows 10 1607< 10.0.14393.9060
MicrosoftWindows 10 1607< 10.0.14393.9060
MicrosoftWindows 10 1809< 10.0.17763.8644
MicrosoftWindows 10 1809< 10.0.17763.8644
MicrosoftWindows 10 21h2< 10.0.19044.7184
MicrosoftWindows 10 21h2< 10.0.19044.7184
MicrosoftWindows 10 21h2< 10.0.19044.7184
MicrosoftWindows 10 22h2< 10.0.19045.7184
MicrosoftWindows 10 22h2< 10.0.19045.7184
MicrosoftWindows 10 22h2< 10.0.19045.7184
MicrosoftWindows 11 23h2< 10.0.22631.6936
MicrosoftWindows 11 23h2< 10.0.22631.6936
MicrosoftWindows 11 24h2< 10.0.26100.8246
MicrosoftWindows 11 24h2< 10.0.26100.8246
MicrosoftWindows 11 25h2< 10.0.26200.8246
MicrosoftWindows 11 25h2< 10.0.26200.8246
MicrosoftWindows 11 26h1< 10.0.28000.1836
MicrosoftWindows 11 26h1< 10.0.28000.1836
MicrosoftWindows Server 2016< 10.0.14393.9060
MicrosoftWindows Server 2019< 10.0.17763.8644
MicrosoftWindows Server 2022< 10.0.20348.5020
MicrosoftWindows Server 2022 23h2< 10.0.25398.2274
MicrosoftWindows Server 2025< 10.0.26100.32690

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    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
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS