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    CVE-2026-51537

    EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.

    Published:Jul 13, 2026
    Last Modified:Aug 11, 2026
    EPS:Jul 13, 2026
    EPSS Score:0.00444
    CVSS Score:9.1

    Affected Products

    Vendor
    Eipstackgroup
    Product
    Opener
    Vendor
    Opener Project
    Product
    Opener

    Exploits

    https://github.com/EIPStackGroup/OpENer/issues/564https://github.com/EIPStackGroup/OpENer/issues/564

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-51541 (CVSS 9.1) — OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in CIP message parsing when handling malformed e…
    CVE-2026-51538 (CVSS 9.1) — EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control vulnerability in its hand…
    CVE-2026-51536 (CVSS 9.1) — In OpENer 2.3.0 (commit 76b95cf) when parsing incoming CIP (Common Industrial Protocol) network packets, the l…
    CVE-2026-51540 (CVSS 9.8) — OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by …
    CVE-2026-51535 (CVSS 7.5) — In OpENer 2.3.0 (commit 76b95cf), a resource exhaustion (Denial of Service) vulnerability exists in its networ…
    CVE-2026-51221 (CVSS 7.5) — A buffer overflow in the Get_Attribute_List function of EIPStackGroup OpENer commit 76b95c allows attackers to…
    CVE-2026-10703 (CVSS 2.1) — A security vulnerability has been detected in EIPStackGroup OpENer up to 2.3.0. Affected is the function Creat…
    CVE-2026-38719 (CVSS 6.2) — OpENer v2.3-558-g1e99582 contains an out-of-bounds read vulnerability in the Common Packet Format (CPF) parser…

    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