June 2025 Patch Tuesday: What You Need to Know
Microsoft’s June 2025 Patch Tuesday delivered a comprehensive security update, addressing 66 vulnerabilities across its ecosystem. This release includes 10 Critical vulnerabilities, one actively exploited zero-day, and multiple high-risk issues affecting Windows, Office, SharePoint, and other enterprise platforms.
Key Vulnerabilities Remediated
Zero-Day Exploit
- CVE-2025-33053 – A remote code execution vulnerability in Web Distributed Authoring and Versioning (WebDAV). This flaw allows attackers to manipulate file paths and execute arbitrary code on vulnerable servers without authentication. It’s actively exploited in the wild and affects platforms like Microsoft IIS, Apache, and Nginx
Microsoft Office
- CVE-2025-47162, CVE-2025-47164, CVE-2025-47167, CVE-2025-47953 – All rated Critical (CVSS 8.4), these vulnerabilities allow remote code execution via the Preview Pane, meaning users don’t need to open malicious files to be compromised
Windows Netlogon
- CVE-2025-33070 – A Critical elevation of privilege vulnerability that lets attackers gain domain admin access without authentication by exploiting uninitialized resources in the Netlogon service
Windows Cryptographic Services (Schannel)
- CVE-2025-29828 – A memory leak in TLS handling allows unauthenticated remote code execution by flooding servers with malicious handshake messages
Windows Remote Desktop Services
- CVE-2025-32710 – A use-after-free vulnerability in the Remote Desktop Gateway role, enabling remote code execution without user interaction
Windows KDC Proxy Service
- CVE-2025-33071 – A race condition vulnerability in Kerberos Key Distribution Center Proxy Service, allowing remote code execution on [MS-KKDCP] configured servers
Microsoft SharePoint Server
- CVE-2025-47172 – A Critical SQL injection vulnerability allowing code execution with minimal permissions
Risks and Known Issues
While these updates significantly improve security posture, they also introduce some operational risks:
- Explorer.exe Failures: Users reported system instability after installing servicing stack 10.0.19041.5911, including broken file explorer functionality
- Login Issues: Post-update authentication problems have been observed, particularly with PIN and password resets on Windows devices
- Preview Pane Exploits: Office vulnerabilities triggered via Preview Pane increase risk for users who rely on file previews, requiring heightened awareness and configuration changes
Recommendations
- Patch Immediately: Prioritize updates for WebDAV, Office, Netlogon, and Remote Desktop Services.
- Disable Preview Pane: Especially in Outlook and Windows Explorer to mitigate Office-based exploits.
- Monitor Post-Update Behavior: Watch for system instability and authentication issues.
- Review Security Scorecards: Ensure remediation efforts are reflected in external portals and dashboards.
