CVE-2026-63550: Mz Automation GmbH LIBIEC61850

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mz Automation GmbH LIBIEC61850: before 1.6.2 (fixed in 1.6.2)

Published 2026-07-30. Last modified 2026-09-03.