CVE-2020-36949: TapinRadio DoS Vulnerability

CVE-2020-36949 Overview

CVE-2020-36949 is a Denial of Service vulnerability affecting TapinRadio 2.13.7, a popular internet radio player and recorder application. The vulnerability exists within the application's proxy settings functionality, where improper input validation allows attackers to crash the program by overflowing input fields. Specifically, attackers can paste a large buffer of approximately 20,000 characters into the username and address fields, causing the application to become unresponsive and potentially requiring reinstallation to restore functionality.

Critical Impact

This vulnerability can render TapinRadio completely unusable, requiring users to reinstall the application to regain functionality. While limited to local exploitation requiring user interaction, successful attacks result in complete loss of availability.

Affected Products

• TapinRadio 2.13.7
• Earlier versions of TapinRadio 2.x may also be affected

Discovery Timeline

• 2026-01-27 - CVE CVE-2020-36949 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2020-36949

Vulnerability Analysis

This vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). The core issue stems from the application's failure to implement proper bounds checking on user-supplied input within the proxy configuration interface. When users configure proxy settings, the username and address input fields do not enforce character limits or validate the length of input data before processing.

The local attack vector means an attacker must have local access to the system or trick a user into pasting malicious content into the affected fields. The vulnerability requires user interaction to trigger, as the victim must actively open the proxy settings dialog and paste or enter the oversized input. Upon successful exploitation, the application experiences a complete denial of service, becoming unresponsive and failing to recover without reinstallation.

Root Cause

The root cause of CVE-2020-36949 is improper resource allocation handling within TapinRadio's proxy settings functionality. The application fails to implement appropriate limits on the size of input that can be processed by the username and address fields. When an excessively large buffer (approximately 20,000 characters) is provided, the application attempts to process this data without adequate memory management, leading to resource exhaustion and application crash.

This type of vulnerability typically occurs when developers do not anticipate or test for edge cases involving oversized input. The lack of input length validation before memory allocation allows the buffer to overwhelm the application's ability to handle the data gracefully.

Attack Vector

The attack requires local access to the target system where TapinRadio is installed. An attacker would need to:

1. Launch TapinRadio on the victim's system
2. Navigate to the proxy settings configuration dialog
3. Paste or enter approximately 20,000 characters into the username or address field
4. The application becomes unresponsive and crashes

The exploitation is straightforward and does not require specialized tools or advanced technical knowledge. The vulnerability mechanism involves overwhelming the input handling routines with an unexpectedly large character buffer. When the oversized input is processed, the application fails to allocate resources appropriately, resulting in a crash condition. Detailed technical analysis is available through the Exploit-DB #49206 reference.

Detection Methods for CVE-2020-36949

Indicators of Compromise

• TapinRadio application crashes or becomes unresponsive during normal operation
• Unexpected memory usage spikes associated with the TapinRadio.exe process
• Application error logs indicating resource allocation failures
• User reports of proxy configuration issues followed by application instability

Detection Strategies

• Monitor for abnormal process behavior associated with TapinRadio.exe, including excessive memory consumption
• Implement endpoint detection rules to identify applications crashing repeatedly in short time periods
• Configure application whitelisting policies to detect unauthorized modifications to TapinRadio installations
• Deploy SentinelOne behavioral AI to detect anomalous resource allocation patterns

Monitoring Recommendations

• Enable Windows Event logging for application crashes and correlate with TapinRadio process events
• Monitor file system activity for signs of reinstallation attempts, which may indicate exploitation
• Implement user activity monitoring to detect unusual clipboard operations involving large text buffers
• Utilize SentinelOne's Storyline technology to track the full context of application crashes

How to Mitigate CVE-2020-36949

Immediate Actions Required

• Verify current TapinRadio installation version and check for available updates from the vendor
• Restrict access to TapinRadio proxy settings for non-administrative users where possible
• Implement application control policies to limit unauthorized modifications
• Educate users about the risk of pasting untrusted content into application settings

Patch Information

Users should check the Raimersoft Homepage for the latest version of TapinRadio that addresses this vulnerability. Organizations should verify that any updates have been tested in a non-production environment before deployment.

Additional details about this vulnerability can be found in the VulnCheck Advisory.

Workarounds

• Avoid using proxy settings in TapinRadio until a patched version is available
• Restrict physical access to systems running vulnerable versions of TapinRadio
• Consider using alternative internet radio applications if proxy functionality is required
• Implement endpoint protection solutions like SentinelOne to detect and prevent exploitation attempts