CVE-2026-61893

MZ Automation GmbH lib60870 — kwetsbaarheid CVE-2026-61893

A crafted IEC 60870-5-104 I-frame with TypeID 104 (C_TS_NA_1) and an inflated object count causes TestCommand_getFromBuffer to read one byte past the end of the heap-allocated message buffer.

CVSS 6.5Patch available

This record: live connection— last retrieved: 24 September 2026 at 05:11.

Vendor

MZ Automation GmbH

Product

lib60870

up to version 2.4.0

Published

31 July 2026

Last modified

8 September 2026

Original source information

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

Technical description

A crafted IEC 60870-5-104 I-frame with TypeID 104 (C_TS_NA_1) and an inflated object count causes TestCommand_getFromBuffer to read one byte past the end of the heap-allocated message buffer.

CVSS 3.1 — vector details

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

Attack vector

NETWORK

Privileges required

NONE

User interaction

NONE

Confidentiality

Limited

Integrity

None

Availability

Limited

EPSS — Exploit Prediction Scoring System

Probability of exploitation within 30 days

0.4%

Percentile

34e

Source: FIRST.org, updated on 23 September 2026.

Patch information

MZ Automation recommends users update to version 2.4.1 when available.

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

46/ 100

Based on CVSS 6.5, EPSS 0.4%, industrial relevance 55/100; raised due to relevance to internet exposure.

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.

Assessed as relevant to the energy sector based on: Vermeld in een officiële CISA ICS Advisory, wat directe relevantie voor industriële besturingssystemen bevestigt. Description mentions an industrial protocol typical of electricity grids (iec104).

This product uses protocols that are relevant to internet exposure analysis. An internet-reachable service is not automatically vulnerable.

Recommended defensive measures

•Apply the latest firmware or software update and validate its integrity.
•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

55/ 100

• Mentioned in an official CISA ICS advisory, which confirms direct relevance to industrial control systems.
• Description mentions an industrial protocol typical of electricity grids (iec104).

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

Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 24 September 2026.

IEC 62443 mapping

IEC 62443-4-1FR3 · Systeemintegriteit

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

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