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CVE-2026-65421— 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MMS BER解码器在解码固定宽度BER字段时未验证攻击者提供的长度值，导致堆缓冲区越界读取，进而可能导致MMS服务进程终止和拒绝服务。

CVSS 6.5 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-65421

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 flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplied length value is not validated, causing a read past the end of a heap buffer. This leads to termination of the MMS service process and a denial-of-service condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/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MMS BER解码器在解码固定宽度BER字段时未验证攻击者提供的长度值，导致堆缓冲区越界读取，进而可能导致MMS服务进程终止和拒绝服务。
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-2026-65421

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III. Intelligence Information for CVE-2026-65421

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Vendor Advisories for CVE-2026-65421 (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-2026-56758 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
CVE-2026-63550 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-2026-65421

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