CVE-2023-3181: Splashtop MIRRORING360 Receiver

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

The C:\Program Files (x86)\Splashtop\Splashtop Software Updater\uninst.exe process creates a folder at C:\Windows\Temp~nsu.tmp and copies itself to it as Au_.exe. The C:\Windows\Temp~nsu.tmp\Au_.exe file is automatically launched as SYSTEM when the system reboots or when a standard user runs an MSI repair using Splashtop Streamer’s Windows Installer. Since the C:\Windows\Temp~nsu.tmp folder inherits permissions from C:\Windows\Temp and Au_.exe is susceptible to DLL hijacking, standard users can write a malicious DLL to it and elevate their privileges.

Affected products

• Splashtop MIRRORING360 Receiver: before 2.4.0.1 (fixed in 2.4.0.1)
• Splashtop MIRRORING360 Sender: before 1.3.0.0 (fixed in 1.3.0.0)
• Splashtop Splashtop: before 3.5.6.0 (fixed in 3.5.6.0); before 3.5.8.0 (fixed in 3.5.8.0)
• Splashtop Splashtop For Rmm: before 3.5.8.0 (fixed in 3.5.8.0)
• Splashtop Streamer: before 3.5.6.0 (fixed in 3.5.6.0)

Published 2024-01-25. Last modified 2026-06-17.