CVE-2020-26555

Pepperl+Fuchs RSM-EX01B product Family — vulnerability CVE-2020-26555

Bluetooth legacy BR/EDR PIN code pairing in Bluetooth Core Specification 1.0B through 5.2 may permit an unauthenticated nearby device to spoof the BD_ADDR of the peer device to complete pairing without knowledge of the PIN.

CVSS 5.4No patch available

This record: live connection— last retrieved: 7 November 2026 at 03:37.

Vendor

Pepperl+Fuchs

Product

RSM-EX01B product Family

up to version vers:all/*

Published

24 May 2021

Last modified

17 June 2026

Original source information

Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.

Technical description

CVSS 3.1 — vector details

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack vector

NETWORK

Privileges required

NONE

User interaction

NONE

Confidentiality

Limited

Integrity

Limited

Availability

None

EPSS — Exploit Prediction Scoring System

Probability of exploitation within 30 days

0.9%

Percentile

59e

Source: FIRST.org, updated on 6 November 2026.

Patch information

The device will play a confirmation sound when a Bluetooth connection is successfully established and a status LED labeled BT indicates that a Bluetooth connection is active. This can be used to detect an unauthenticated connection.

IACS Radar assessment

Our own interpretation and context for the source data above.

IACS Radar assessment

Our own interpretation and context for this vulnerability — not an official source.

IACS Radar priority score

33/ 100

Based on CVSS 5.4, EPSS 0.9%, industrial relevance 40/100.

Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.

Conditions for exploitation

•Network access to the affected device or segment is required.
•No valid credentials are needed.
•No user interaction required.

Operational impact & energy relevance

Limited impact on availability; the risk lies mainly with confidentiality or integrity of process data.

No strong energy-sector-specific signals recognised; general OT/ICS relevance.

Recommended defensive measures

•Limit user rights to what is strictly necessary through role-based access.
•Restrict network access to the affected device to a dedicated OT management segment.
•Implement network segmentation in line with zones and conduits (IEC 62443-3-2).
•Monitor for abnormal protocol traffic using an OT-aware detection system.

Industrial relevance score

40/ 100

• Mentioned in an official CISA ICS advisory, which confirms direct relevance to industrial control systems.

Classification is provisional; manual verification by an OT security analyst is recommended.

Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.

IEC 62443 mapping

IEC 62443-4-2FR2 · Gebruiksbeheer

Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.

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