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    CVE-2021-27861

    Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)

    Published:Sep 27, 2022
    Last Modified:Nov 4, 2025
    EPS:Sep 27, 2022
    EPSS Score:0.00066
    CVSS Score:4.7

    Affected Products

    Vendor
    Ieee
    Product
    Ieee 802.2
    Vendor
    Ietf
    Product
    P802.1q

    Exploits

    No exploit reference

    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