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MicrosoftKB5035855

HistoryMar 12, 2024 - 7:00 a.m.

March 12, 2024—KB5035855 (OS Build 14393.6796)

2024-03-1207:00:00

Microsoft

support.microsoft.com

367

kb5035855

os build 14393.6796

install kb5037423

lsass memory leak

security update guide

march 2024 security updates

windows server update services

windows update terminology

windows 10

kb5035962

microsoft update catalog

servicing stack updates

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

7.3 High

AI Score

Confidence

High

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

44.1%

JSON

March 12, 2024—KB5035855 (OS Build 14393.6796)

NEW 3/22/24 IMPORTANT If you plan to install this update on a domain controller (DC), we highly recommend that you install KB5037423 instead (March 22, 2024). This out-of-band update addresses a known issue that affects the Local Security Authority Subsystem Service (LSASS). It might leak memory on DCs.

11/19/20
For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 1607, see its update history page.

Highlights

This update addresses security issues for your Windows operating system.

Improvements

This security update includes quality improvements. When you install this KB:

This update makes miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device. For more information about security vulnerabilities, please refer to the new Security Update Guide website and the March 2024 Security Updates.

Known issues in this update

Symptom	Workaround
Following installation of this update, Local Security Authority Subsystem Service (LSASS) may experience a memory leak on domain controllers (DCs). This is observed when on-premises and cloud-based Active Directory Domain Controllers service Kerberos authentication requests.

Extreme memory leaks may cause LSASS to crash, which triggers an unscheduled reboot of underlying domain controllers (DCs).| This issue is addressed in KB5037423.

How to get this update

Before installing this updateMicrosoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security updates. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions. If you are using Windows Update, the latest SSU (KB5035962) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.Install this update****Release Channel	Available	Next Step
Windows Update and Microsoft Update	Yes	None. This update will be downloaded and installed automatically from Windows Update.
Windows Update for Business	Yes	None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	Yes	This update will automatically sync with WSUS if you configure Products and Classifications as follows:Product: Windows 10Classification: Security Updates File informationFor a list of the files that are provided in this update, download the file information for cumulative update 5035855.