Privilege Elevation Vulnerability in Windows Ancillary Function Driver by Microsoft
CVE-2026-68820

7HIGH

Key Information:

Vendor: Microsoft
Status: Windows 10 Version 1607; Windows 10 Version 1809; Windows 10 Version 21h2; Windows 10 Version 22h2
Vendor: CVE Published:; 11 August 2026

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What is CVE-2026-68820?

CVE-2026-68820 is a privilege elevation vulnerability found in the Windows Ancillary Function Driver associated with the WinSock networking component provided by Microsoft. This driver plays a crucial role in managing network communications for Windows applications. The vulnerability arises from a flaw in memory management, specifically a "use after free" condition that can be exploited by an authenticated attacker to gain elevated privileges on the local system. If successfully executed, this could allow the attacker to execute arbitrary code with higher privileges, potentially granting full control over the affected system and access to sensitive data and functionalities.

Organizations utilizing affected versions of the Windows operating system must treat this vulnerability with urgency, as it poses a significant risk to their security posture. The ability for an attacker to elevate privileges locally could lead to widespread repercussions within a network, including further exploitation or lateral movement to more critical systems.

Potential Impact of CVE-2026-68820

Unauthorized Access and Control: Exploiting this vulnerability can enable an attacker to gain unauthorized administrative-level access to the affected system. This may lead to the installation of malware, data exfiltration, or manipulation of system configurations, ultimately compromising organizational security.
Increased Risk of Secondary Attacks: Once an attacker has elevated privileges, they can use the compromised system as a jumping-off point for more extensive attacks on the network. This could involve attacking other critical infrastructure components or deploying additional malware, including ransomware.
Data Integrity and Confidentiality Breaches: With elevated privileges, attackers can access and modify critical data, which poses risks to both data integrity and confidentiality. This not only jeopardizes sensitive organizational information but may also have regulatory repercussions if data protection laws are violated through unauthorized access or data manipulation.

CISA has reported CVE-2026-68820

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-68820 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: 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.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9418

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.9115

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7663

News Articles

Cxotoday

CVE-2026-68820

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