Improper Certificate Validation in the Firmware Download vulnerability (CVE-2026-86474) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-86474

Improper Certificate Validation in the Firmware Download vulnerability

Answer in brief

CVE-2026-86474 records a Unknown severity vulnerability in Improper Certificate Validation in the Firmware Download vulnerability. The current sources do not mark it as known exploited. The current feed maps Fermax Electronica S.A.U./DUOX PLUS monitor firmware (VEO Wi-Fi range) (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 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 Fermax Electronica S.A.U./DUOX PLUS monitor firmware (VEO Wi-Fi range) (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Fermax Electronica S.A.U./DUOX PLUS monitor firmware (VEO Wi-Fi range)generic	>=0 <01.48.001	01.48.001

Recommended response

Check inventory. Check lockfiles and deployed manifests for Fermax Electronica S.A.U./DUOX PLUS monitor firmware (VEO Wi-Fi range).
Review the reported fix. Update Fermax Electronica S.A.U./DUOX PLUS monitor firmware (VEO Wi-Fi range) to 01.48.001 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Source referencefermax.com

Upstream source description

The lack of TLS certificate validation when downloading firmware updates in VEO and VEO-XS Wi-Fi monitors, in versions prior to 01.48.001, allows an attacker to perform man-in-the-middle attacks on the update channel.

Quoted source text, attributed separately from HOL analysis.