The MMS BER decoder contains a boundary-handling flaw in the processing
of certain fields within confirmed-request messages. When a crafted
BER-encoded element is received over an established MMS session (TCP
port 102), the decoder may advance its internal read position
incorrectly, leading to a heap out-of-bounds read. This condition causes
the MMS handling process to terminate unexpectedly, resulting in a
denial-of-service.
Advisories

No advisories yet.

Fixes

Solution

MZ Automation GmbH recommends that users update to version 1.6.2.


Workaround

No workaround given by the vendor.

History

Fri, 31 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 31 Jul 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Mz-automation
Mz-automation libiec61850
Vendors & Products Mz-automation
Mz-automation libiec61850

Thu, 30 Jul 2026 23:15:00 +0000

Type Values Removed Values Added
Description The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over an established MMS session (TCP port 102), the decoder may advance its internal read position incorrectly, leading to a heap out-of-bounds read. This condition causes the MMS handling process to terminate unexpectedly, resulting in a denial-of-service.
Title MZ Automation libiec61850 Out-of-bounds Read
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-07-31T15:57:05.901Z

Reserved: 2026-07-27T19:32:49.393Z

Link: CVE-2026-63550

cve-icon Vulnrichment

Updated: 2026-07-31T15:56:58.192Z

cve-icon NVD

Status : Received

Published: 2026-07-30T23:16:52.443

Modified: 2026-07-31T16:17:09.170

Link: CVE-2026-63550

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T10:30:18Z

Weaknesses