CISA ADP Vulnrichment

Answer in brief

CVE-2026-8066 records a Critical severity (CVSS 9.1) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps Hitachi Energy/RTU500 series CMU firmware (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Hitachi Energy/RTU500 series CMU firmware (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Hitachi Energy/RTU500 series CMU firmwaregeneric	>=9.0 <12.0	12.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Hitachi Energy/RTU500 series CMU firmware.
Review the reported fix. Update Hitachi Energy/RTU500 series CMU firmware to 12.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Source referencepublisher.hitachienergy.com

Upstream source description

A directory traversal vulnerability in the file upload functionality of Hitachi Energy RTU500 end-of-life versions allows an unauthenticated attacker to write or overwrite arbitrary files on the device file system. Depending on the files affected, successful exploitation could result in unauthorized modification of device data or disruption of the device’s intended operation.

Quoted source text, attributed separately from HOL analysis.