Security Experts:

Connect with us

Hi, what are you looking for?


Application Security

Microsoft Ships Massive Security Patch Bundle

It’s raining patches in the Microsoft Windows ecosystem.

It’s raining patches in the Microsoft Windows ecosystem.

The Redmond, Wash. software giant on Tuesday dropped a mega-batch of security updates with patches for a whopping 89 documented vulnerabilities, including one used in zero-day attacks against some in the white-hat hacker community.

This month’s Patch Tuesday whopper comes just one week after Microsoft scrambled out emergency fixes to provide cover for in-the-wild nation-state attacks targeting Exchange Server installations.

Microsoft has blamed those attacks on Chinese cyber-espionage actors operating from leased VPS (virtual private servers) in the United States.  The APT group has hit tens of thousands of organizations around the world, including targeted sectors like defense contractors, policy think tanks, and NGOs.

[ ALSO SEE: Multiple Exchange Server Zero-Days Under Attack ]

Microsoft also provided cover for a separate Internet Explorer vulnerability (CVE-2021-26411) that was used by North Korean government-backed hackers to target security researchers in South Korea.  

The IE zero-day (Internet Explorer, interestingly, remains widely deployed in South Korea, was flagged by security vendor ENKI in February alongside a warning about drive-by browser IE downloads. Security researchers at Kaspersky have linked the attacks to a sub-group under Lazarus, the infamous North Korean threat actor known for launching destructive malware and ransomware attacks across the globe.

[ ALSO SEE: Google Chrome, Microsoft IE Zero-Days in Crosshairs ]

In all, Microsoft documented 89 distinct vulnerabilities across a range of software and cloud-delivered products in its portfolio.  The patches cover serious flaws in multiple Windows OS components, Office and Office Services and Web Apps, SharePoint Server, Visual Studio, Azure and Azure Sphere.

Microsoft slapped a critical rating on 14 of the 89 documented vulnerabilities, while 75 carry an “important” severity rating. 

According to Microsoft, two of these bugs are listed as publicly known while five are listed as under active attack at the time of release.

As usual, TippingPoint ZDI has a comprehensive wrap-up of this month’s Microsoft patch release.

RELATED: Google Warning: North Korean Gov Hackers Targeting Security Researchers 

RELATED: Microsoft Server Hack Has Victims Hustling to Stop Intruders

Written By

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join this webinar to learn best practices that organizations can use to improve both their resilience to new threats and their response times to incidents.


Join this live webinar as we explore the potential security threats that can arise when third parties are granted access to a sensitive data or systems.


Expert Insights

Related Content

Application Security

Cycode, a startup that provides solutions for protecting software source code, emerged from stealth mode on Tuesday with $4.6 million in seed funding.

Data Protection

The CRYSTALS-Kyber public-key encryption and key encapsulation mechanism recommended by NIST for post-quantum cryptography has been broken using AI combined with side channel attacks.


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Data Protection

The cryptopocalypse is the point at which quantum computing becomes powerful enough to use Shor’s algorithm to crack PKI encryption.


The changing nature of what we still generally call ransomware will continue through 2023, driven by three primary conditions.


WASHINGTON - Cyberattacks are the most serious threat facing the United States, even more so than terrorism, according to American defense experts. Almost half...

Application Security

PayPal is alerting roughly 35,000 individuals that their accounts have been targeted in a credential stuffing campaign.


No one combatting cybercrime knows everything, but everyone in the battle has some intelligence to contribute to the larger knowledge base.