Detections
Analytics

KB5073379: Windows Server 2025 Security Update (January 2026)

high Nessus Plugin ID 290251

Synopsis

The remote Windows host is affected by multiple vulnerabilities.

Description

The remote Windows host is missing security update 5073379. It is, therefore, affected by multiple vulnerabilities

 - Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network. (CVE-2026-20854)

 - 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.

Solution

Apply Security Update 5073379

See Also

https://support.microsoft.com/help/5073379

Plugin Details

Severity: High

ID: 290251

File Name: smb_nt_ms26_jan_5073379.nasl

Version: 1.1

Type: local

Agent: windows

Published: 1/16/2026

Updated: 1/16/2026

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-20854

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2023-31096

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 10/10/2023

Reference Information

CVE: CVE-2023-31096, CVE-2024-55414, CVE-2026-0386, CVE-2026-20804, CVE-2026-20808, CVE-2026-20809, CVE-2026-20811, CVE-2026-20812, CVE-2026-20814, CVE-2026-20815, CVE-2026-20816, CVE-2026-20817, CVE-2026-20820, CVE-2026-20821, CVE-2026-20822, CVE-2026-20823, CVE-2026-20824, CVE-2026-20825, CVE-2026-20826, CVE-2026-20827, CVE-2026-20828, CVE-2026-20829, CVE-2026-20831, CVE-2026-20832, CVE-2026-20833, CVE-2026-20834, CVE-2026-20835, CVE-2026-20836, CVE-2026-20837, CVE-2026-20838, CVE-2026-20839, CVE-2026-20840, CVE-2026-20842, CVE-2026-20843, CVE-2026-20844, CVE-2026-20847, CVE-2026-20849, CVE-2026-20851, CVE-2026-20852, CVE-2026-20854, CVE-2026-20856, CVE-2026-20857, CVE-2026-20858, CVE-2026-20859, CVE-2026-20860, CVE-2026-20861, CVE-2026-20862, CVE-2026-20863, CVE-2026-20864, CVE-2026-20865, CVE-2026-20866, CVE-2026-20867, CVE-2026-20868, CVE-2026-20869, CVE-2026-20870, CVE-2026-20871, CVE-2026-20872, CVE-2026-20873, CVE-2026-20874, CVE-2026-20875, CVE-2026-20876, CVE-2026-20877, CVE-2026-20918, CVE-2026-20919, CVE-2026-20921, CVE-2026-20922, CVE-2026-20923, CVE-2026-20924, CVE-2026-20925, CVE-2026-20926, CVE-2026-20927, CVE-2026-20931, CVE-2026-20932, CVE-2026-20934, CVE-2026-20936, CVE-2026-20937, CVE-2026-20939, CVE-2026-20941, CVE-2026-20962, CVE-2026-21221, CVE-2026-21265

MSFT: MS26-5073379

MSKB: 5073379