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Vulnerabilities CVE-2026-66349

CVE-2026-66349

Medium
Open
TLP:CLEAR

MZ Automation libiec61850 Out-of-bounds Read

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Description

The MMS server connection handler contains a flaw in its processing of BER-encoded request data. When an MMS confirmed request PDU containing an extended BER tag is received over an established session, the decoder may advance its internal buffer incorrectly due to a missing bounds check. This results in a one byte heap out-of-bounds read and causes the MMS service process to terminate, leading to a denial-of-service condition.

Details

CVSS Score
6.5
EPSS Score
0.18%

7.9th percentile

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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