Microsoft Released Huge Patch Tuesday Update For January 2025

The Patch Tuesday update for January 2025 from Microsoft is substantial, with over 150 security fixes. It even addresses some actively exploited flaws, requiring prompt system updates from the users.

Microsoft Patch Tuesday January 2025 Overview

Microsoft’s first security updates for this year include several important security fixes addressing serious vulnerabilities. The most noteworthy include the following actively exploited or publicly disclosed vulnerabilities.

• CVE-2025-21333, CVE-2025-21334, CVE-2025-21335 (important; CVSS 7.8): Privilege escalation vulnerabilities in Hyper-V NT Kernel Integration Virtual Service Provider (VSP). An attacker could exploit the flaws to gain SYSTEM privileges on the target device. Microsoft confirmed detecting active exploitation attempts for these vulnerabilities prior to a fix.
• CVE-2025-21186, CVE-2025-21366, CVE-2025-21395 (important; CVSS 7.8): Arbitrary code execution vulnerabilities in Microsoft Access. A remote attacker could exploit these flaws to execute arbitrary codes locally on the target machine. Exploiting the flaw merely required social engineering techniques, such as sending malicious emails, to trick the victim user into downloading or opening a maliciously crafted file. Microsoft confirmed public disclosure of these vulnerabilities before the fix, but the flaws escaped active exploitation.
• CVE-2025-21275 (important; CVSS 7.8): A publicly disclosed privilege escalation vulnerability in Windows App Package Installer allowing SYSTEM privileges to an adversary.
• CVE-2025-21308 (important; CVSS 6.5): A spoofing vulnerability in Windows Themes. While Microsoft urges users to update their systems as soon as possible for this flaw, they even recommended mitigation to prevent the threat – blocking NTLM hash via group policy. Besides, this vulnerability doesn’t affect systems with disabled NTLM.

Alongside these vulnerabilities, Microsoft also addressed 11 critical severity flaws and 140 important severity issues across different products. These include 47 remote code execution, 33 privilege escalation, 19 denial-of-service flaws, 21 information disclosure, 15 security feature bypass flaws, and 4 spoofing vulnerabilities.

While Microsoft ensured the automatic rollout of January 2025 Patch Tuesday updates to eligible devices, users should still check their systems manually for any updates to avoid potential threats.

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