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    CVE-2026-67873

    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

    Published:Aug 5, 2026
    Last Modified:Aug 7, 2026
    EPS:Aug 5, 2026
    EPSS Score:0.00172
    CVSS Score:9.8

    Affected Products

    Vendor
    Mz-automation
    Product
    Lib60870

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-61893 (CVSS 6.9) — A crafted IEC 60870-5-104 I-frame with TypeID 104 (C_TS_NA_1) and an inflated object count causes TestCommand…
    CVE-2026-63033 (CVSS 6.9) — A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes In…
    CVE-2026-16002 (CVSS 8.8) — The affected product is vulnerable to an Out-of-bounds read, which may allow an attacker to crash the parsing …
    CVE-2026-51219 (CVSS 7.5) — A heap buffer overflow in the HighPriorityASDUQueue_hasUnconfirmedIMessages function of lib60870 v2.3.3 to v2.…
    CVE-2024-45971 (CVSS 9.8) — Multiple Buffer overflows in the MMS Client in MZ Automation LibIEC61850 before commit 1f52be9ddeae00e69cd43e4…
    CVE-2024-45970 (CVSS 9.8) — Multiple Buffer overflows in the MMS Client in MZ Automation LibIEC61850 before commit ac925fae8e281ac6defcd63…
    CVE-2023-23205 (CVSS 5.5) — An issue was discovered in lib60870 v2.3.2. There is a memory leak in lib60870/lib60870-C/examples/multi_clien…
    CVE-2021-45773 (CVSS 7.5) — A NULL pointer dereference in CS104_IPAddress_setFromString at src/iec60870/cs104/cs104_slave.c of lib60870 co…
    CVE-2021-21778 (CVSS 7.5) — A denial of service vulnerability exists in the ASDU message processing functionality of MZ Automation GmbH li…
    CVE-2019-6137 (CVSS 7.5) — An issue was discovered in lib60870 2.1.1. LinkLayer_setAddress in link_layer/link_layer.c has a NULL pointer …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High