• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

 | 

Sophos fixed two critical Sophos Firewall vulnerabilities

 | 

French Authorities confirm XSS.is admin arrested in Ukraine

 | 

Microsoft linked attacks on SharePoint flaws to China-nexus actors

 | 

Cisco confirms active exploitation of ISE and ISE-PIC flaws

 | 

SharePoint under fire: new ToolShell attacks target enterprises

 | 

CrushFTP zero-day actively exploited at least since July 18

 | 

Hardcoded credentials found in HPE Aruba Instant On Wi-Fi devices

 | 

MuddyWater deploys new DCHSpy variants amid Iran-Israel conflict

 | 

U.S. CISA urges to immediately patch Microsoft SharePoint flaw adding it to its Known Exploited Vulnerabilities catalog

 | 

Microsoft issues emergency patches for SharePoint zero-days exploited in "ToolShell" attacks

 | 

SharePoint zero-day CVE-2025-53770 actively exploited in the wild

 | 

Singapore warns China-linked group UNC3886 targets its critical infrastructure

 | 

U.S. CISA adds Fortinet FortiWeb flaw to its Known Exploited Vulnerabilities catalog

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 54

 | 

Security Affairs newsletter Round 533 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

Radiology Associates of Richmond data breach impacts 1.4 million people

 | 

Fortinet FortiWeb flaw CVE-2025-25257 exploited hours after PoC release

 | 

Authorities released free decryptor for Phobos and 8base ransomware

 | 

Anne Arundel Dermatology data breach impacts 1.9 million people

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Security
  • Microsoft Patch Tuesday for January 2021 fixes 83 flaws, including an actively exploited issue

Microsoft Patch Tuesday for January 2021 fixes 83 flaws, including an actively exploited issue

Pierluigi Paganini January 13, 2021

Microsoft Patch Tuesday security updates for January 2021 address 83 vulnerabilities, including a critical flaw actively exploited in the wild.

Microsoft Patch Tuesday security updates for January 2021 fix 83 security vulnerabilities in multiple products, including Microsoft Windows, Edge (EdgeHTML-based), ChakraCore, Office and Microsoft Office Services and Web Apps, Visual Studio, Microsoft Malware Protection Engine, .NET Core, ASP .NET, and Azure. 10 of these flaws are rated as Critical and 73 are rated as Important in severity. Seven of the addressed flaws were submitted through the ZDI program.

The IT giant has addressed a zero-day RCE flaw in Microsoft Defender, tracked as CVE-2021-1647, that resides in the Malware Protection Engine component (mpengine.dll).

The Microsoft Malware Protection Engine component provides the scanning, detection, and cleaning capabilities for Microsoft antimalware software.

Microsoft did not disclose details on the attacks in the wild that exploited this flaw.

The remaining critical remote code execution vulnerabilities addressed by the company are listed below:

CVETitleSeverityPublicExploitedType
CVE-2021-1647Microsoft Defender Remote Code Execution VulnerabilityCriticalNoYesRCE
CVE-2021-1648Microsoft splwow64 Elevation of Privilege VulnerabilityImportantYesNoEoP
CVE-2021-1665GDI+ Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1643HEVC Video Extensions Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1668Microsoft DTV-DVD Video Decoder Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1705Microsoft Edge (HTML-based) Memory Corruption VulnerabilityCriticalNoNoRCE
CVE-2021-1658Remote Procedure Call Runtime Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1660Remote Procedure Call Runtime Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1666Remote Procedure Call Runtime Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1667Remote Procedure Call Runtime Remote Code Execution VulnerabilityCriticalNoNoRCE
CVE-2021-1673Remote Procedure Call Runtime Remote Code Execution VulnerabilityCriticalNoNoRCE

The remaining vulnerabilities addressed by Microsoft Patch Tuesday for January are rated as “important” and are code execution, information disclosure, and denial-of-service issues.

Another interesting flaw addressed by Microsoft is a Microsoft splwow64 elevation of privilege vulnerability, tracked as CVE-2021-1648.

The flaw was discovered by the popular Google Project Zero expert Maddie Stone.

“While this issue is labeled as an elevation of privilege, it can also be exploited to disclose information. The type of information that could be disclosed if an attacker successfully exploited this vulnerability is uninitialized memory.” reads the security advisory published by Microsoft.

“This issue has been publicly disclosed by Google Project Zero (PZ2096) and the Zero Day Initiative (ZDI-CAN-11349 through 11351).”

As usually let me suggest reading the security update review published by the Zero Day Initiative that also highlights the importance of the following flaws addressed by Microsoft:

  • CVE-2021-1677 – Azure Active Directory Pod Identity Spoofing Vulnerability
  • CVE-2021-1674 – Windows Remote Desktop Protocol Core Security Feature Bypass Vulnerability

“In looking at the Important-rated bugs that could allow RCE, the SharePoint bug should not be ignored. It does require authentication, but it could allow an authenticated user to take complete control of the system.” states ZDI.

If you want to receive the weekly Security Affairs Newsletter for free subscribe here.

[adrotate banner=”9″][adrotate banner=”12″]

Pierluigi Paganini

(SecurityAffairs – hacking, Microsoft Patch Tuesday)

[adrotate banner=”5″]

[adrotate banner=”13″]


facebook linkedin twitter

DOS Hacking hacking news information security news IT Information Security malware Microsoft Patch Tuesday Pierluigi Paganini RCE Security Affairs Security News Windows zero-Day

you might also like

Pierluigi Paganini July 23, 2025
U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog
Read more
Pierluigi Paganini July 23, 2025
Sophos fixed two critical Sophos Firewall vulnerabilities
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

    Hacking / July 23, 2025

    Sophos fixed two critical Sophos Firewall vulnerabilities

    Security / July 23, 2025

    French Authorities confirm XSS.is admin arrested in Ukraine

    Cyber Crime / July 23, 2025

    Microsoft linked attacks on SharePoint flaws to China-nexus actors

    APT / July 23, 2025

    Cisco confirms active exploitation of ISE and ISE-PIC flaws

    Hacking / July 22, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT