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CVE-2026-63033— MZ Automation lib60870 Out-of-bounds Read

Quick assessment

Affected
MZ Automation lib60870
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.

构造的 IEC 60870-5-104 I 帧中声明的对象数量超过了 ASDU 主体所能容纳的范围，导致 InformationObject_ParseObjectAddress 函数在读取时越界访问，超出堆分配的消息缓冲区末尾一个字节。

CVSS 6.5 · Medium EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
MZ Automation lib60870 2.4.0 affected
2.4.1 unaffected
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I. Basic Information for CVE-2026-63033

Vulnerability Information
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Vulnerability Title
MZ Automation lib60870 Out-of-bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MZ Automation lib60870 2.4.0 -

II. Public POCs for CVE-2026-63033

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III. Intelligence Information for CVE-2026-63033

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Vendor Advisories for CVE-2026-63033 (3)

IV. Related Vulnerabilities

Same product: lib60870
Same vendor: MZ Automation
Same weakness: CWE-125

V. Comments for CVE-2026-63033

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