Quantum Secular Labs / Blog / Advisories

CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

CVE-2026-33824 is rated critical with a CVSS v3.1 base score of 9.8 and affects Microsoft Internet Key Exchange (IKE) Service Extensions, along with 13 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-18, which means exploitation in the wild has been observed.

Vulnerability description

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

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-415: Double Free

The product calls free() twice on the same memory address.

Affected products

  • Microsoft Windows 10 1607: before 10.0.14393.9060
  • Microsoft Windows 10 1809: before 10.0.17763.8644
  • Microsoft Windows 10 21h2: before 10.0.19044.7184
  • Microsoft Windows 10 22h2: before 10.0.19045.7184
  • Microsoft Windows 11 23h2: before 10.0.22631.6936
  • Microsoft Windows 11 24h2: before 10.0.26100.8246
  • Microsoft Windows 11 25h2: before 10.0.26200.8246
  • Microsoft Windows 11 26h1: before 10.0.28000.1836
  • Microsoft Windows Server 2016: before 10.0.14393.9060
  • Microsoft Windows Server 2019: before 10.0.17763.8644
  • Microsoft Windows Server 2022: before 10.0.20348.5020
  • Microsoft Windows Server 2022 23h2: before 10.0.25398.2274
  • Microsoft Windows Server 2025: before 10.0.26100.32690

References