Yamaha LAN Monitor for Windows: Insecure DLL loading in installer
Summary
The installer of Yamaha LAN Monitor for Windows up to version 1.9.3 loads Dynamic Link Libraries from an insecure search path. If the installer is started from a directory containing a specially crafted DLL, the DLL is loaded and code runs with administrative privileges. The attacker must place the file locally and the user must run the installer; the issue affects only installation and not already installed copies.
Affected
- Yamaha LAN Monitor for Windows Ver.1.9.3 and earlier
Fixed in
- Yamaha LAN Monitor for Windows Ver.1.10.1 or later (the vendor's current download is Ver.1.11.1)
Workaround
- Run only installers obtained from the official Yamaha website.
- Do not use installers included in ZIP files from third parties.
Exploitation
- Not known to be exploited; the CVE is not listed in CISA KEV.
- No public exploit or proof of concept found as of the research date.
Our recommendation
- Update to Ver.1.10.1 or later, preferably the current version, using only the installer from Yamaha's official website.
- Run installers only from a clean, local, write-protected directory, not from Downloads, network shares or unpacked archives.
- Limit use to admin workstations and apply application allow-listing or EDR there.
- Check whether admins run the tool from third-party ZIP files.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- JVN advisory (EN) jvn.jp
- JVN advisory (JP) jvn.jp
- Yamaha FAQ www.rtpro.yamaha.co.jp
- Yamaha download page network.yamaha.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 11:52.
Original description (NVD)
The installer for Yamaha LAN Monitor for Windows provided by Yamaha Corporation may insecurely load Dynamic Link Libraries (DLLs). When the installer is launched in a directory containing a specially crafted DLL file, the malicious DLL may be loaded, resulting in arbitrary code execution with administrative privileges.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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