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    CVE-2021-4464

    FiberHome AN5506-04-FA firmware versions up to and including RP2631 and HG6245D prior to RP2602 contain a stack-based buffer overflow, as the HTTP service ('webs') fails to enforce maximum lengths for Cookie header values. When a cookie longer than 511 bytes is processed, a stack buffer is overrun, leading to a crash or potential control of execution flow.

    Published:Nov 12, 2025
    Last Modified:Apr 15, 2026
    EPS:Nov 12, 2025
    EPSS Score:0.00422
    CVSS Score:9.3

    Affected Products

    Vendor
    Fiberhome
    Product
    An5506-04-fa
    Vendor
    Fiberhome
    Product
    An5506-04-fa Firmware
    Vendor
    Fiberhome
    Product
    Hg6245d
    Vendor
    Fiberhome
    Product
    Hg6245d Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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