IT Pro is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Learn more

Microsoft patches actively exploited Internet Explorer flaw

The latest Patch Tuesday sees the Windows developer patch a fifth actively exploited bug disclosed within a week

The Internet Explorer icon as seen on a smartphone in behind a screen with lines of code

Microsoft has fixed dozens of security flaws across its suite of products, including a critical Internet Explorer bug that’s been previously exploited by state-backed North Korean hackers to attack security researchers.

The flaw, tracked as CVE-2021-26411, is a memory corruption vulnerability that’s allowed hackers to run malware on victims’ machines by luring them into accessing a malicious website.

This is the fifth actively exploited Microsoft vulnerability to be patched in recent weeks, after four Microsoft Exchange Server flaws were disclosed last week. 

These five fixes were included in the latest Patch Tuesday wave of updates among 89 patches across Microsoft products, including fixes for 14 critically-rated vulnerabilities.

The latest actively-exploited remote code exploitation flaw affects Internet Explorer versions 9 and 11, as well as the HTML-based Microsoft Edge, which itself reached end-of-life today. Internet Explorer will stop being supported with updates from 17 August this year.

The Internet Explorer vulnerability was previously reported as a zero-day by the South Korean security firm Enki in February, which itself was targeted by hackers exploiting the bug.  

To trigger the exploit, an attacker would first have to craft a website, or take advantage of a compromised website and convince a user to view it. This would usually be done by undergoing a phishing exercise, either by sending an email or text message or prompting users to download a malicious email attachment.

Related Resource

Cost of a data breach report 2020

Find out what factors help mitigate breach costs

cost of a data breach report 2020 - whitepaper from IBMDownload now

The discovery of a sixth actively-exploited flaw in recent weeks is sure to raise alarms considering the potentially devastating effects that the recent Microsoft Exchange Server exploitation has rendered.

The White House weighed in over the weekend, advising businesses to patch their systems immediately due to the risk of intrusion, with security researchers warning there could be hundreds of thousands of prospective victims across the world. One organisation that’s among the first confirmed victims of the attacks is the European Banking Authority

Featured Resources

Accelerating AI modernisation with data infrastructure

Generate business value from your AI initiatives

Free Download

Recommendations for managing AI risks

Integrate your external AI tool findings into your broader security programs

Free Download

Modernise your legacy databases in the cloud

An introduction to cloud databases

Free Download

Powering through to innovation

IT agility drive digital transformation

Free Download

Recommended

Kaspersky exposes MysterySnail zero-day exploit in Windows
zero-day exploit

Kaspersky exposes MysterySnail zero-day exploit in Windows

13 Oct 2021

Most Popular

Salaries for the least popular programming languages surge as much as 44%
Development

Salaries for the least popular programming languages surge as much as 44%

23 Jun 2022
The top programming languages you need to learn for 2022
Careers & training

The top programming languages you need to learn for 2022

23 Jun 2022
Swift exit: How the world cut off Russian banks
finance

Swift exit: How the world cut off Russian banks

24 Jun 2022