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April Patch Tuesday: 1 Zero-Day in Large Batch of Flaws
Microsoft's April security update arrived Tuesday, featuring fixes for 121 vulnerabilities – the biggest patch load for the year.
While the number of bulletins may be high, Microsoft bounced back from last month's seven zero-day flaw fixes with just one this month. As always it should be the top patching priority for IT.
CVE-2025-29824 addresses an elevation of privilege flaw in the Windows Common Log File System. The good news is that this vulnerability has not been seen exploited in the wild. However, the means to exploit the issue -- which affects all supported versions of Windows OS and Windows Server -- is out there, so expect attacks to be developed shortly.
This vulnerability is critical as it targets a fundamental component of Windows, potentially affecting everything from enterprise environments to critical infrastructure. If successfully exploited, it enables attackers to escalate privileges to SYSTEM level -- the highest level of access in the Windows operating system.
While this is the only zero-day exploiting Windows at the OS level, don't expect it to be the last, according to Tyler Reguly, associate director at secirty firm Fortra. He said that flaws like these tend to signal the coming of similar issues in the coming months.
"When a vulnerability in CLFS is patched, people tend to dig around and look at what’s going on and come across other vulnerabilities in the process," Reguly said. "If I was a gambler, I would bet on CLFS appearing again next month."
Once that is addressed, IT's best course of action is to apply the 11 bulletins rated "critical" by Microsoft with all of them dealing with always-dangerous remote code execution vulnerabilities. They include:
Click here for the full list of April's security bulletins.