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CVE-2026-66720— 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GOOSE subscriber组件未正确验证UTC时间戳字段，特制GOOSE帧包含过小的UTC时间戳字段可触发堆越界读取，导致进程崩溃并造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.29% · P19

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-2026-66720

Vulnerability Information
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Vulnerability Title
MZ Automation libiec61850 Out-of-bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted GOOSE frame containing an undersized timestamp field can trigger a heap out-of-bounds read during message processing, causing the process to crash and resulting in 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GOOSE subscriber组件未正确验证UTC时间戳字段，特制GOOSE帧包含过小的UTC时间戳字段可触发堆越界读取，导致进程崩溃并造成拒绝服务。
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-2026-66720

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III. Intelligence Information for CVE-2026-66720

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Vendor Advisories for CVE-2026-66720 (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-2026-63550 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-2026-66720

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