Is CVE-2026-33824 being actively exploited?

Yes. CVE-2026-33824 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on August 18, 2026.

What is the CVSS score for CVE-2026-33824?

CVE-2026-33824 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-33824

CRITICAL · CVSS 9.8CISA KEV: actively exploitedEPSS 1.6%EU EUVD: exploited

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

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-415
EPSS score: 1.6% (76th percentile)
In CISA KEV: Yes, added August 18, 2026
In EU EUVD: Yes (EUVD-2026-22641)
Published: April 14, 2026
NVD last modified: September 25, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

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

Added to the KEV catalog on August 18, 2026; federal remediation due August 21, 2026.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-22641 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 15, 2026.

View on the EU Vulnerability Database

Affected products

microsoft / windows 10 1607
microsoft / windows 10 1607
microsoft / windows 10 1809
microsoft / windows 10 1809
microsoft / windows 10 21h2
microsoft / windows 10 21h2
microsoft / windows 10 21h2
microsoft / windows 10 22h2
microsoft / windows 10 22h2
microsoft / windows 10 22h2
microsoft / windows 11 23h2
microsoft / windows 11 23h2
microsoft / windows 11 24h2
microsoft / windows 11 24h2
microsoft / windows 11 25h2
microsoft / windows 11 25h2
microsoft / windows 11 26h1
microsoft / windows 11 26h1
microsoft / windows server 2016
microsoft / windows server 2019
microsoft / windows server 2022
microsoft / windows server 2022 23h2
microsoft / windows server 2025

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Microsoft Windows 10 and Server version 1903 (May 2019 Update) - Microsoft Corporation - Common Criteria 2019-22-INF-2839 - archived

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824(Vendor Advisory)
https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/(Third Party Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824(US Government Resource)

Last updated September 27, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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