CVE-2025-29830: Windows 10 1507 Information Disclosure Flaw

CVE-2025-29830 Overview

CVE-2025-29830 is an information disclosure vulnerability affecting the Windows Routing and Remote Access Service (RRAS) component across a wide range of Microsoft Windows operating systems. The vulnerability stems from the use of an uninitialized resource (CWE-908), which allows an unauthorized attacker to disclose sensitive information over a network without requiring authentication.

The Windows Routing and Remote Access Service is a critical network infrastructure component that provides routing services, VPN connectivity, and network address translation (NAT) capabilities. Due to the widespread deployment of RRAS in enterprise environments for remote access solutions, this vulnerability presents a significant risk for organizations relying on this service for network connectivity.

Critical Impact

Unauthorized attackers can exploit this uninitialized memory vulnerability to remotely disclose potentially sensitive information from affected Windows systems without authentication, though user interaction is required.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
• Microsoft Windows Server 2008, 2012, 2016, 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

• May 13, 2025 - CVE-2025-29830 published to NVD
• May 19, 2025 - Last updated in NVD database

Technical Details for CVE-2025-29830

Vulnerability Analysis

This vulnerability is classified as an Uninitialized Memory Use issue (CWE-908), occurring within the Windows Routing and Remote Access Service. When RRAS processes certain network requests, it fails to properly initialize memory resources before use, potentially exposing contents of memory that may contain sensitive information.

The exploitation requires network access to the vulnerable service and some form of user interaction, limiting the attack surface compared to fully remote, zero-click vulnerabilities. However, the impact on confidentiality is significant, as successful exploitation could expose sensitive data stored in memory, including configuration details, credentials, or other information processed by the RRAS service.

The vulnerability affects both x86 and x64 architectures on Windows 10, as well as x64 and ARM64 architectures on Windows 11, demonstrating that the underlying code issue is present across multiple platform implementations of RRAS.

Root Cause

The root cause of CVE-2025-29830 lies in improper memory initialization within the RRAS service code. When processing network requests, the service allocates memory buffers that are not properly zeroed or initialized before being used to store or transmit data. This results in memory regions containing residual data from previous operations being inadvertently included in responses or accessible to attackers.

CWE-908 (Use of Uninitialized Resource) describes this pattern where a resource is used or accessed before it has been properly initialized, leading to undefined behavior and, in this case, information disclosure. The vulnerability exists because the code path handling certain RRAS operations does not ensure complete initialization of data structures before they are processed or returned to network clients.

Attack Vector

The attack vector for CVE-2025-29830 is network-based, requiring the attacker to send specially crafted requests to a system running the vulnerable RRAS service. The attack does not require prior authentication, but does require some form of user interaction to complete successfully.

An attacker positioned on the network could target Windows systems with RRAS enabled, sending malicious requests designed to trigger the uninitialized memory access. The disclosed information could potentially be leveraged for further attacks, including credential theft, reconnaissance for lateral movement, or exploitation of additional vulnerabilities discovered through the leaked data.

The vulnerability specifically targets the confidentiality of the system - there is no direct impact on integrity or availability. This means the attacker cannot modify system data or cause service disruption through this vulnerability alone, but the information gained could facilitate more damaging follow-up attacks.

Detection Methods for CVE-2025-29830

Indicators of Compromise

• Unusual network traffic patterns targeting RRAS service ports (typically TCP 1723 for PPTP or UDP 500/4500 for IKEv2)
• Anomalous RRAS service behavior or unexpected memory access patterns in system logs
• Suspicious authentication attempts or connection requests to VPN services from unknown sources
• Evidence of reconnaissance activities targeting Windows routing infrastructure

Detection Strategies

• Monitor RRAS service logs for unusual connection patterns or error conditions that may indicate exploitation attempts
• Implement network intrusion detection rules to identify malformed or suspicious RRAS protocol traffic
• Deploy endpoint detection and response (EDR) solutions capable of monitoring for memory disclosure patterns
• Review Windows Security event logs for RRAS-related events that may indicate unauthorized access attempts

Monitoring Recommendations

• Enable verbose logging for the Routing and Remote Access Service to capture detailed operational data
• Configure network monitoring to alert on unexpected RRAS traffic volumes or connection patterns
• Implement SentinelOne's behavioral analysis to detect potential exploitation of uninitialized memory vulnerabilities
• Establish baseline metrics for normal RRAS operation to facilitate anomaly detection

How to Mitigate CVE-2025-29830

Immediate Actions Required

• Apply the latest Microsoft security updates for all affected Windows systems as soon as possible
• Assess whether RRAS is actively required and disable the service on systems where it is not needed
• Implement network segmentation to restrict access to systems running RRAS to authorized networks only
• Review firewall rules to limit exposure of RRAS service ports to trusted IP ranges

Patch Information

Microsoft has released security updates to address this vulnerability. Organizations should consult the Microsoft Security Response Center advisory for CVE-2025-29830 for detailed patch information and download links specific to each affected Windows version.

The patch addresses the uninitialized memory issue by ensuring proper initialization of resources before they are used within the RRAS service. All affected Windows versions from Windows Server 2008 through Windows Server 2025 and Windows 10/11 client systems have corresponding updates available.

Workarounds

• Disable the Routing and Remote Access Service on systems where it is not required for business operations
• Implement strict network access controls using firewalls to limit RRAS exposure to trusted networks only
• Deploy VPN solutions through alternative methods or third-party products while awaiting patch deployment
• Use network-level authentication mechanisms to restrict access to RRAS services to authorized users

# Disable RRAS service on Windows systems where not required
sc config RemoteAccess start= disabled
sc stop RemoteAccess

# Verify service status
sc query RemoteAccess