Microsoft April 2025 Patch Tuesday: Critical Updates Fixing 134 Vulnerabilities, Including a Zero-Day Exploit CVE-2025-29824

Microsoft has released its April 2025 Patch Tuesday updates, marking one of the most significant security releases of the year. This month’s update addresses 134 vulnerabilities across its software ecosystem, including one actively exploited zero-day vulnerability. As reported by BleepingComputer, theses patches span multiple categories, with 11 critical flaws that demand immediate attention from system administrators and users alike.

See also: Microsoft’s March 2025 Patch Tuesday Addresses 57 Vulnerabilities, Including 7 Critical Zero-Day Flaws

Microsoft April 2025 Patch Tuesday updates

1. Zero-Day Exploit (CVE-2025-29824)

The most concerning vulnerability is CVE-2025-29824, an elevation of privilege flaw in the Windows Common Log File System (CLFS) driver. This issue stems from improper memory handling, allowing attackers to gain SYSTEM-level privileges without requiring administrative access. Cybersecurity experts warn that this vulnerability is particularly dangerous in post-compromise scenarios, enabling attackers to maintain persistence and move laterally across networks.

2. Critical Vulnerabilities

Microsoft patched 31 remote code execution (RCE) vulnerabilities, including:

1. CVE-2025-26663: LDAP RCE Vulnerability
2. CVE-2025-27745: Microsoft Office RCE Vulnerability
3. CVE-2025-27480: Remote Desktop Services RCE Vulnerability

These flaws could allow attackers to execute malicious code remotely, posing significant risks to unpatched systems.

3. Quality Updates for Windows

The update includes non-security improvements:

1. Windows 11 KB5055523 enhances machine password rotation and AI-powered features like Windows Search.
2. Updates for Windows 10 KB5055518 are delayed but expected soon. Download the update manually from the Microsoft Update Catalog.

4. Breakdown of Vulnerabilities

The vulnerabilities addressed in this update span several categories:

1. Elevation of Privilege: 49 vulnerabilities
2. Remote Code Execution: 31 vulnerabilities
3. Information Disclosure: 17 vulnerabilities
4. Denial of Service: 14 vulnerabilities
5. Security Feature Bypass: 9 vulnerabilities
6. Spoofing: 3 vulnerabilities.

Why These April 2025 Patch Tuesday Updates Matter

The actively exploited zero-day vulnerability highlights the urgency of applying these April 2025 Patch Tuesday updates. Attackers leveraging CVE-2025-29824 can escalate permissions beyond initial access levels, enabling them to install malware, modify system settings, or access sensitive data. Furthermore, the critical RCE flaws in widely used components like Microsoft Office and Remote Desktop Services underscore the importance of securing enterprise environments.

Microsoft’s April 2025 Patch Tuesday updates serve as a reminder of the ever-evolving threat landscape in cybersecurity. With over a hundred vulnerabilities addressed—including an actively exploited zero-day—this update is crucial for maintaining system integrity and protecting sensitive data.

Below is the complete list of resolved vulnerabilities in the April 2025 Patch Tuesday updates.

Microsoft’s April 2025 Patch Tuesday highlights the importance of regular updates in combating cybersecurity threats. With over 134 vulnerabilities addressed, including critical flaws and an actively exploited zero-day vulnerability, applying these patches is essential for safeguarding your systems.

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