CVE-2026-63033: CWE-125 in MZ Automation lib60870
CVE-2026-63033 is a medium severity vulnerability in MZ Automation's lib60870 version 2.4.0. It involves a heap buffer over-read caused by a crafted IEC 60870-5-104 I-frame with an object count that exceeds the buffer size, leading to reading one byte past the allocated message buffer.
AI Analysis
Technical Summary
This vulnerability (CWE-125) in lib60870 version 2.4.0 occurs when the InformationObject_ParseObjectAddress function processes an IEC 60870-5-104 I-frame with a declared object count larger than what fits in the ASDU body. This causes the function to read one byte beyond the end of the heap-allocated message buffer, resulting in a heap buffer over-read.
Potential Impact
The vulnerability allows an attacker to cause a read beyond the allocated buffer, potentially leading to information disclosure and a low level of availability impact. There is no indication of code execution or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published. Users should monitor vendor communications for updates and avoid processing untrusted IEC 60870-5-104 I-frames with suspicious object counts until a fix is available.
CVE-2026-63033: CWE-125 in MZ Automation lib60870
Description
CVE-2026-63033 is a medium severity vulnerability in MZ Automation's lib60870 version 2.4.0. It involves a heap buffer over-read caused by a crafted IEC 60870-5-104 I-frame with an object count that exceeds the buffer size, leading to reading one byte past the allocated message buffer.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/mz-automation/lib60870Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-125) in lib60870 version 2.4.0 occurs when the InformationObject_ParseObjectAddress function processes an IEC 60870-5-104 I-frame with a declared object count larger than what fits in the ASDU body. This causes the function to read one byte beyond the end of the heap-allocated message buffer, resulting in a heap buffer over-read.
Potential Impact
The vulnerability allows an attacker to cause a read beyond the allocated buffer, potentially leading to information disclosure and a low level of availability impact. There is no indication of code execution or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published. Users should monitor vendor communications for updates and avoid processing untrusted IEC 60870-5-104 I-frames with suspicious object counts until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-07-16T22:10:53.026Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6bdccd9c2644c7f8d9d032
Added to database: 07/30/2026, 23:22:53 UTC
Last enriched: 07/30/2026, 23:53:36 UTC
Last updated: 07/31/2026, 00:29:48 UTC
Views: 5
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