Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

The remote Windows host is missing security update 5075899. It is, therefore, affected by multiple vulnerabilities

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

  - Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
    (CVE-2026-21244, CVE-2026-21248)

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 5075906. It is, therefore, affected by multiple vulnerabilities

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

  - Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
    (CVE-2026-21244, CVE-2026-21248)

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 5075897. It is, therefore, affected by multiple vulnerabilities

  - A heap-based buffer overflow issue was discovered in libjpeg-turbo in h2v2_merged_upsample_internal()     function of jdmrgext.c file. The vulnerability can only be exploited with 12-bit data precision for which     the range of the sample data type exceeds the valid sample range, hence, an attacker could craft a 12-bit     lossless JPEG image that contains out-of-range 12-bit samples. An application attempting to decompress     such image using merged upsampling would lead to segmentation fault or buffer overflows, causing an     application to crash. (CVE-2023-2804)

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

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 5075941. It is, therefore, affected by multiple vulnerabilities

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

  - Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
    (CVE-2026-21244, CVE-2026-21248)

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 5077179. It is, therefore, affected by multiple vulnerabilities

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

  - Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
    (CVE-2026-21244, CVE-2026-21248)

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 5077181. It is, therefore, affected by multiple vulnerabilities

  - Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security     feature over a network. (CVE-2026-21513)

  - Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an     authorized attacker to elevate privileges locally. (CVE-2026-21519)

  - Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
    (CVE-2026-21244, CVE-2026-21248)

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
298563	KB5075899: Windows Server 2025 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	high
298562	KB5075906: Windows Server 2022 / Azure Stack HCI 22H2 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	high
298558	KB5075897: Windows Server version 23H2 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	medium
298554	KB5075941: Windows 11 version 23H2 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	high
298553	KB5077179: Windows 11 Version 26H1 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	high
298551	KB5077181: Windows 11 Version 24H2 / Windows 11 Version 25H2 Security Update (February 2026)	Nessus	Windows : Microsoft Bulletins	high

Detections

Analytics

CVE-2026-21241

high

Tenable Plugins

high

high

medium

high

high

high