CVE-2026-21427
DLL Search Path Vulnerability in PIONEER Installers Enables Code Execution
Publication date: 2026-01-08
Last updated on: 2026-01-08
Assigner: JPCERT/CC
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| pioneer_corporation | aps-da101js | * |
| pioneer_corporation | aps-da101jr | * |
| pioneer_corporation | aps-da101jgl | * |
| pioneer_corporation | aps-da101jgr | * |
| pioneer_corporation | aps-s201js | * |
| pioneer_corporation | aps-s201jr | * |
| pioneer_corporation | aps-s201jgl | * |
| pioneer_corporation | aps-s201jgr | * |
| pioneer_corporation | aps-s202j-lm | * |
| pioneer_corporation | aps-s301 | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-427 | The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves insecure Dynamic Link Library (DLL) loading in the installers of multiple PIONEER CORPORATION products. Due to an uncontrolled DLL search path, the installer may load malicious DLLs, allowing an attacker to execute arbitrary code with the privileges of the running installer. [1]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability relates to insecure DLL search paths in installers for multiple PIONEER CORPORATION products, which may lead to arbitrary code execution. Detection involves checking the DLL search paths used by the installers to identify if they include insecure directories. Specific commands are not provided in the resources, but generally, you can use tools like Process Monitor (ProcMon) on Windows to monitor DLL loading behavior during installer execution, or use command-line tools to inspect the installer files for DLL dependencies and search paths. Since no direct detection commands are provided, contacting PIONEER CORPORATION or monitoring for unusual DLL loads during installation is recommended. [1]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps are not directly provided in the resources. However, users are advised to contact PIONEER CORPORATION for solutions or updates. Additionally, avoid running the vulnerable installers from untrusted directories, and do not execute installers with elevated privileges unless necessary. Monitoring and restricting DLL search paths or applying security best practices for software installation may help reduce risk until official patches or updates are available. [1, 2]
How can this vulnerability impact me? :
If exploited, this vulnerability can allow an attacker to execute arbitrary code on your system with the same privileges as the installer. This could lead to unauthorized actions such as installing malware, modifying system settings, or compromising system integrity. [1]