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    CVE-2026-63033

    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.

    Published:Jul 30, 2026
    Last Modified:Jul 31, 2026
    EPS:Jul 30, 2026
    EPSS Score:0.00264
    CVSS Score:6.5

    Affected Products

    Vendor
    Mz-automation
    Product
    Lib60870

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-67873 (CVSS 9.8) — A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The…
    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-2026-16002 (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