Security Updates for Windows 10 / Windows Server 2016 / Windows Server 2019 (March 2019) (Spectre) (Meltdown) (Foreshadow)

medium Nessus Plugin ID 122975
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote Windows host is missing a microcode update.


The remote Windows host is missing a security update. It is, therefore, missing microcode updates to address the following vulnerabilities:

- Spectre Variant 3a (CVE-2018-3640: Rogue System Register Read (RSRE)).

- Spectre Variant 4 (CVE-2018-3639: Speculative Store Bypass (SSB))

- L1TF (CVE-2018-3620, CVE-2018-3646: L1 Terminal Fault)

Note that Nessus did not actually test for these flaws nor checked the target processor architecture but instead, has relied on the version of mcupdate_GenuineIntel.dll to be latest for supported Windows release.


Microsoft has released security updates for Windows 10, Windows Server 2016 and Server 2019.

See Also

Plugin Details

Severity: Medium

ID: 122975

File Name: smb_nt_ms19_mar_oob_microcode.nasl

Version: 1.6

Type: local

Agent: windows

Published: 3/20/2019

Updated: 4/15/2021

Dependencies: smb_check_rollup.nasl, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl, enumerate_ms_azure_vm_win.nbin

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2018-3646


Risk Factor: High

Score: 7.2


Risk Factor: Medium

Base Score: 4.7

Temporal Score: 3.7

Vector: AV:L/AC:M/Au:N/C:C/I:N/A:N

Temporal Vector: E:POC/RL:OF/RC:C


Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/MS_Bulletin_Checks/Possible, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/18/2019

Vulnerability Publication Date: 5/22/2018

Reference Information

CVE: CVE-2018-3620, CVE-2018-3639, CVE-2018-3640, CVE-2018-3646

BID: 104228, 104232, 105080

MSKB: 4465065, 4346084, 4346085, 4346086, 4346087, 4346088

MSFT: MS19-4465065, MS19-4346084, MS19-4346085, MS19-4346086, MS19-4346087, MS19-4346088