CVE-2019-25559: Nsasoft SpotPaltalk DOS Vulnerability

CVE-2019-25559 Overview

CVE-2019-25559 is a denial of service vulnerability in Nsasoft SpotPaltalk version 1.1.5. The flaw resides in the registration code input field of the application. A local attacker can paste an excessively long string of approximately 1000 characters into the Name/Key field during registration. Clicking the OK button triggers an application crash due to improper handling of oversized input. The vulnerability is classified under [CWE-1260: Improper Handling of Overlap Between Protected Memory Ranges].

Critical Impact
Local attackers can crash the SpotPaltalk application by submitting a 1000-character buffer into the Name/Key registration field, producing a denial of service condition on the affected host.

Affected Products

Nsasoft SpotPaltalk 1.1.5
CPE: cpe:2.3:a:nsasoft:spotpaltalk:1.1.5:*:*:*:*:*:*:*
Vendor: Nsasoft

Discovery Timeline

2026-03-21 - CVE-2019-25559 published to NVD
2026-04-16 - Last updated in NVD database

Technical Details for CVE-2019-25559

Vulnerability Analysis

The vulnerability affects the registration dialog within SpotPaltalk 1.1.5. When a user enters a value into the Name/Key field, the application does not enforce a bounded length on the supplied buffer. Submitting input of approximately 1000 characters and clicking OK causes the process to terminate unexpectedly. The flaw is exploitable only by a local user with the ability to interact with the registration interface. Successful exploitation results in loss of availability but does not affect confidentiality or integrity. The issue is referenced in the VulnCheck Advisory on SpotPaltalk and a public proof of concept exists at Exploit-DB #46822.

Root Cause

The root cause is improper input validation in the registration handler. The Name/Key field accepts arbitrary-length user-supplied data without enforcing a maximum size or sanitizing the buffer before processing. When the OK button is activated, the oversized buffer triggers a fault that crashes the application process. This pattern is consistent with [CWE-1260] weaknesses involving memory range handling.

Attack Vector

Exploitation requires local access and user interaction. An attacker with access to a session running SpotPaltalk 1.1.5 opens the registration dialog, pastes a buffer of roughly 1000 characters into the Name/Key field, and submits the form. No network access, authentication, or elevated privileges are required, but the user must interact with the registration prompt. The attack does not yield code execution based on available references — only an application crash.

No verified exploit code is reproduced here. Public technical details are available via the Exploit-DB #46822 entry referenced by the advisory.

Detection Methods for CVE-2019-25559

Indicators of Compromise

Unexpected termination of the spotpaltalk.exe process shortly after the registration dialog is opened.
Windows Application event log entries showing application crash (Event ID 1000) referencing the SpotPaltalk binary.
Presence of Windows Error Reporting (WER) crash dumps associated with SpotPaltalk on affected hosts.

Detection Strategies

Monitor process termination telemetry for SpotPaltalk binaries followed by repeated relaunches on the same host.
Correlate user interaction events with the registration dialog and subsequent crash events to identify intentional triggering.
Inventory endpoints running Nsasoft SpotPaltalk 1.1.5 using software asset management tooling to scope exposure.

Monitoring Recommendations

Forward Windows Application and System event logs to a centralized log platform for correlation against process crash patterns.
Track installation and execution of spotpaltalk.exe across managed endpoints, especially on shared or kiosk-style systems.
Alert on repeated crash-restart cycles of the SpotPaltalk process from the same user session within a short interval.

How to Mitigate CVE-2019-25559

Immediate Actions Required

Identify all endpoints running Nsasoft SpotPaltalk 1.1.5 and assess business need for the application.
Remove or uninstall SpotPaltalk 1.1.5 from systems where it is not required, given its limited current support footprint.
Restrict local interactive access on shared workstations where the application remains installed.

Patch Information

No vendor patch is referenced in the advisory data for CVE-2019-25559. Consult the VulnCheck Advisory on SpotPaltalk and the vendor site at NSA Auditor Tool Overview for any updated guidance or replacement releases.

Workarounds

Avoid pasting untrusted content into the SpotPaltalk Name/Key field and educate users about the crash condition.
Apply application allowlisting policies to prevent unauthorized installations of vulnerable SpotPaltalk versions.
Replace SpotPaltalk 1.1.5 with a supported alternative if a fixed release is not available from Nsasoft.

bash

# Example: query installed SpotPaltalk versions on Windows endpoints via PowerShell
Get-CimInstance -ClassName Win32_Product |
  Where-Object { $_.Name -like "*SpotPaltalk*" } |
  Select-Object Name, Version, Vendor, InstallDate