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    CVE-2026-63550

    The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over an established MMS session (TCP port 102), the decoder may advance its internal read position incorrectly, leading to a heap out-of-bounds read. This condition causes the MMS handling process to terminate unexpectedly, resulting in a denial-of-service.

    Published:Jul 30, 2026
    Last Modified:Jul 31, 2026
    EPS:Jul 30, 2026
    EPSS Score:0.00249
    CVSS Score:6.5

    Affected Products

    Vendor
    Mz-automation
    Product
    Libiec61850

    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

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    CVE-2026-18583 (CVSS 5.5) — A weakness has been identified in mz-automation libiec61850 up to 1.6.1. This issue affects the function check…
    CVE-2026-18582 (CVSS 5.5) — A security flaw has been discovered in mz-automation libiec61850 up to 1.6.1. This vulnerability affects the f…
    CVE-2026-52134 (CVSS 9.8) — An issue in the parseGoosePayload() function (/goose/goose_receiver.c) of libiec61850 v1.6 allows attackers to…
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    CVE-2026-65421 (CVSS 7.1) — The MMS BER decoder contains a flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplie…
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    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