CVE-2026-33824

Published Apr 14, 2026

Last updated 22 days ago

Exploit known CVSS critical 9.8

Jwt

Network

Zero-day

Tunneling protocol

VPN

Msrpc

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-33824 is a double free vulnerability found within the Windows Internet Key Exchange (IKE) Extension. This memory corruption flaw allows an unauthorized attacker to execute arbitrary code over a network. The vulnerability specifically affects the Windows IPsec IKE service, which is responsible for establishing secure VPN connections and managing cryptographic key exchanges. The flaw can be exploited remotely without authentication or user interaction by sending specially crafted UDP packets to ports 500 (IKE) or 4500 (NAT-T IKE) on a vulnerable Windows system. These malicious packets trigger the double free condition during IKE message parsing, potentially leading to heap corruption and ultimately enabling remote code execution.

Description: Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Source: secure@microsoft.com
NVD status: Analyzed
Products: 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_2016, windows_server_2019, windows_server_2022, windows_server_2022_23h2, windows_server_2025

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
Exploit added on: Aug 18, 2026
Exploit action due: Aug 21, 2026
Required action: 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.

Weaknesses

secure@microsoft.com: CWE-415

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.