CVE-2026-86474 PUBLISHED

Improper Certificate Validation in the Firmware Download vulnerability

Assigner: FERMAX
Reserved: 07.09.2026 Published: 16.09.2026 Updated: 16.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Fermax Electronica S.A.U.
Product	DUOX PLUS monitor firmware (VEO Wi-Fi range)
Versions	Default: unaffected affected from 0 to 01.48.001 (excl.)

Credits

Pedro J. Núñez-Cacho Fuentes (Tunelko) finder
INCIBE-CERT coordinator

References

Fermax security advisories

Problem Types

CWE-295 Improper Certificate Validation CWE

Impacts

CAPEC-94 Adversary in the Middle (AiTM)