What is the CVSS score of CVE-2026-21427?

CVE-2026-21427 has a CVSS 3.0 base score of 7.8 (High). CVSS vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-21427?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

CVE-2026-21427

HIGH

Uncontrolled Search Path Element (CWE-427)

2026-01-08 vultures@jpcert.or.jp

Privilege Escalation RCE

7.8

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 08, 2026 - 04:15 nvd

HIGH 7.8

DescriptionCVE.org

The installers for multiple products provided by PIONEER CORPORATION contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries. As a result, arbitrary code may be executed with the privileges of the running installer.

AnalysisAI

Arbitrary code execution in PIONEER CORPORATION product installers through DLL search path manipulation allows local attackers with user interaction to execute malicious code with installer privileges. The vulnerability affects multiple products and requires user interaction to trigger, potentially compromising system integrity during software installation. No patch is currently available.

Technical ContextAI

Classified as CWE-427 (Uncontrolled Search Path Element). The installers for multiple products provided by PIONEER CORPORATION contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries. As a result, arbitrary code may be executed with the privileges of the running installer.

Affected ProductsAI

The installers for multiple products provided by PIONEER CORPORATION contain an issue with the DLL search path, which may lead to insecurely loading D