CVE-2019-25548: BlueStacks DOS Vulnerability

CVE-2019-25548 Overview

CVE-2019-25548 is a denial of service vulnerability affecting BlueStacks 4.80.0.1060, a popular Android emulator for Windows and macOS. The vulnerability allows local attackers to crash the application by submitting oversized input to the search field. Specifically, attackers can paste a buffer of 100,000 'A' characters into the search field and trigger a search operation, causing the application to become unresponsive and crash.

Critical Impact

Local attackers can disrupt BlueStacks operations by exploiting improper input validation in the search field, leading to application crashes and denial of service conditions.

Affected Products

• BlueStacks 4.80.0.1060

Discovery Timeline

• 2026-03-21 - CVE CVE-2019-25548 published to NVD
• 2026-03-23 - Last updated in NVD database

Technical Details for CVE-2019-25548

Vulnerability Analysis

This vulnerability is classified under CWE-466 (Return of Pointer Value Outside of Expected Range), though the practical exploitation manifests as an input validation failure leading to denial of service. The application fails to properly validate or limit the size of user input in the search field before processing it. When an exceptionally large string (approximately 100,000 characters) is submitted, the application cannot handle the oversized input, resulting in resource exhaustion or memory corruption that causes a crash.

The local attack vector means that an attacker must have some level of access to the system running BlueStacks to exploit this vulnerability. While the vulnerability does not compromise confidentiality or integrity, it has a high impact on availability as it can completely crash the BlueStacks application.

Root Cause

The root cause of this vulnerability is improper input validation in the BlueStacks search functionality. The application does not implement adequate boundary checks or input length restrictions on the search field, allowing arbitrarily large strings to be processed. When the search operation is triggered with an oversized buffer, the application's memory handling fails to gracefully manage the excessive data, leading to a crash condition.

Attack Vector

The attack vector is local, requiring the attacker to have access to the target system where BlueStacks is installed. The exploitation is straightforward and requires no special privileges or user interaction beyond the attacker's own actions:

1. Open the BlueStacks application on the target system
2. Navigate to the search field within the application
3. Paste a large buffer (e.g., 100,000 'A' characters) into the search field
4. Initiate a search operation
5. The application crashes, resulting in denial of service

Technical details and proof-of-concept information can be found in the Exploit-DB #46893 entry and the VulnCheck Advisory.

Detection Methods for CVE-2019-25548

Indicators of Compromise

• BlueStacks application crashes unexpectedly during search operations
• System event logs showing BlueStacks process termination with memory-related errors
• Unusual memory consumption spikes by the BlueStacks process immediately before crashes

Detection Strategies

• Monitor BlueStacks application logs for crash events and abnormal termination patterns
• Implement endpoint detection rules to identify clipboard operations involving extremely large text strings followed by BlueStacks crashes
• Deploy application behavior monitoring to detect memory exhaustion patterns in virtualization software

Monitoring Recommendations

• Configure application crash monitoring for HD-Player.exe and related BlueStacks processes
• Set up alerts for repeated BlueStacks crashes that may indicate exploitation attempts
• Monitor system resource utilization for sudden memory spikes associated with BlueStacks operations

How to Mitigate CVE-2019-25548

Immediate Actions Required

• Update BlueStacks to the latest available version from the official BlueStacks website
• Restrict local access to systems running BlueStacks to trusted users only
• Consider implementing application whitelisting to prevent unauthorized use of BlueStacks in sensitive environments

Patch Information

Users should upgrade to a version of BlueStacks newer than 4.80.0.1060 to address this vulnerability. Check the official BlueStacks website for the latest stable release and security updates. The vendor has not published a specific security advisory for this issue, but newer versions include improved input handling mechanisms.

Workarounds

• Limit access to the BlueStacks application to trusted users only, as exploitation requires local access
• Implement endpoint protection solutions that can detect and prevent denial of service attempts on local applications
• Consider using application virtualization or sandboxing to isolate BlueStacks from critical system resources
• Monitor and restrict clipboard operations in high-security environments where BlueStacks is deployed