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CVE-2026-63550— MZ Automation libiec61850 Out-of-bounds Read

Quick assessment

Affected
MZ Automation GmbH libiec61850
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MZ Automation GmbH libiec61850是德国MZ Automation GmbH公司开源的一套支持IEC 61850标准的工业通信组件。 MZ Automation GmbH libiec61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于边界处理缺陷，在处理确认请求消息中的某些字段时内部读取位置推进不正确，导致堆越界读取，可能导致MMS处理进程意外终止，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.44% · P36

Affected Version Matrix 2

VendorProduct Version RangeStatus
MZ Automation GmbH libiec61850 < 1.6.2 affected
1.6.2 unaffected
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I. Basic Information for CVE-2026-63550

Vulnerability Information
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Vulnerability Title
MZ Automation libiec61850 Out-of-bounds Read
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
MZ Automation GmbH libiec61850 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MZ Automation GmbH libiec61850是德国MZ Automation GmbH公司开源的一套支持IEC 61850标准的工业通信组件。 MZ Automation GmbH libiec61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于边界处理缺陷，在处理确认请求消息中的某些字段时内部读取位置推进不正确，导致堆越界读取，可能导致MMS处理进程意外终止，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MZ Automation GmbH libiec61850 0 ~ 1.6.2 -

II. Public POCs for CVE-2026-63550

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III. Intelligence Information for CVE-2026-63550

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Vendor Advisories for CVE-2026-63550 (2)

Same Patch Batch · MZ Automation GmbH · 2026-07-30 · 8 CVEs total

CVE-2026-66360 7.5 HIGH MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66349 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66364 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-65421 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-56758 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66369 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66720 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read

IV. Related Vulnerabilities

Same product: libiec61850
Same vendor: MZ Automation GmbH
Same weakness: CWE-125

V. Comments for CVE-2026-63550

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