Vulnerability DatabaseCVE-2026-67873
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CVE-2026-67873
Published:August 05, 2026
Updated:August 31, 2026
A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data
Related Resources (6)
https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc
https://github.com/mz-automation/lib60870/releases/tag/v2.4.0
https://github.com/mz-automation/lib60870/issues/201
https://github.com/mz-automation/lib60870
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67873.json
https://nvd.nist.gov/vuln/detail/CVE-2026-67873
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Heap-based Buffer Overflow
CWE-122
EPSS
Base Score:
0.40