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    CVE-2021-21777

    An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.

    Published:Jun 17, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 17, 2021
    EPSS Score:0.00342
    CVSS Score:10

    Affected Products

    Vendor
    Opener Project
    Product
    Opener

    Exploits

    https://talosintelligence.com/vulnerability_reports/TALOS-2021-1234https://talosintelligence.com/vulnerability_reports/TALOS-2021-1234

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-51538 (CVSS 9.1) — EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control vulnerability in its hand…
    CVE-2026-51537 (CVSS 9.1) — EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of …
    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-2026-51541 (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-2026-51540 (CVSS 9.8) — OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by …
    CVE-2022-43605 (CVSS 10) — An out-of-bounds write vulnerability exists in the SetAttributeList attribute_count_request functionality of E…
    CVE-2022-43604 (CVSS 10) — An out-of-bounds write vulnerability exists in the GetAttributeList attribute_count_request functionality of E…
    CVE-2022-43606 (CVSS 7.5) — A use-of-uninitialized-pointer vulnerability exists in the Forward Open connection_management_entry functional…
    CVE-2022-32434 (CVSS 7.8) — EIPStackGroup OpENer v2.3.0 was discovered to contain a stack overflow via /bin/posix/src/ports/POSIX/OpENer+0…
    CVE-2021-27500 (CVSS 7.5) — A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions pri…

    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