New Windows RasMan zero-day flaw gets free, unofficial patches

BleepingComputer

December 12, 2025 at 11:28 AM

Actively Exploited

Windows Zero-day Microsoft Vulnerability

Overview

A new zero-day vulnerability has been discovered in Windows that affects the Remote Access Connection Manager (RasMan) service, allowing attackers to crash it. This flaw could disrupt remote access services for users and organizations relying on Windows systems. Unofficial patches have been made available for users who want to mitigate the risk before an official fix is released. As this vulnerability is a zero-day, it is crucial for affected users to apply these patches promptly to avoid potential exploitation. The issue underscores the need for vigilance in maintaining system security, especially for those using Windows.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Windows operating systems utilizing the Remote Access Connection Manager (RasMan) service
Action Required: Free unofficial patches are available; users should apply them immediately to protect against this vulnerability.
Timeline: Newly disclosed

Original Article Summary

Free unofficial patches are available for a new Windows zero-day vulnerability that allows attackers to crash the Remote Access Connection Manager (RasMan) service. [...]

Impact

Windows operating systems utilizing the Remote Access Connection Manager (RasMan) service

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Free unofficial patches are available; users should apply them immediately to protect against this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Windows, Zero-day, Microsoft, and 1 more.

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