Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

The remote Windows host is missing security update 5073724. It is, therefore, affected by multiple vulnerabilities

  - Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to     elevate privileges locally. (CVE-2026-20857)

  - An issue was discovered in Broadcom) LSI PCI-SV92EX Soft Modem Kernel Driver through 2.2.100.1 (aka     AGRSM64.sys). There is Local Privilege Escalation to SYSTEM via a Stack Overflow in RTLCopyMemory (IOCTL     0x1b2150). An attacker can exploit this to elevate privileges from a medium-integrity process to SYSTEM.
    This can also be used to bypass kernel-level protections such as AV or PPL, because exploit code runs with     high-integrity privileges and can be used in coordinated BYOVD (bring your own vulnerable driver)     ransomware campaigns. (CVE-2023-31096)

  - Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege Vulnerability     (CVE-2026-20832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Windows host is missing security update 5073723. It is, therefore, affected by multiple vulnerabilities

  - Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to     elevate privileges locally. (CVE-2026-20857)

  - An issue was discovered in Broadcom) LSI PCI-SV92EX Soft Modem Kernel Driver through 2.2.100.1 (aka     AGRSM64.sys). There is Local Privilege Escalation to SYSTEM via a Stack Overflow in RTLCopyMemory (IOCTL     0x1b2150). An attacker can exploit this to elevate privileges from a medium-integrity process to SYSTEM.
    This can also be used to bypass kernel-level protections such as AV or PPL, because exploit code runs with     high-integrity privileges and can be used in coordinated BYOVD (bring your own vulnerable driver)     ransomware campaigns. (CVE-2023-31096)

  - Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege Vulnerability     (CVE-2026-20832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
283473	KB5073724: Windows 10 version 21H2 / Windows 10 Version 22H2 Security Update (January 2026)	Nessus	Windows : Microsoft Bulletins	high
283470	KB5073723: Windows 10 version 1809 / Windows Server 2019 Security Update (January 2026)	Nessus	Windows : Microsoft Bulletins	high

Detections

Analytics

CVE-2026-20810

high

Tenable Plugins

high

high