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    CVE-2017-20190

    Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a "Zalgo text" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.

    Published:Mar 26, 2024
    Last Modified:Apr 15, 2026
    EPS:Mar 26, 2024
    EPSS Score:0.00096
    CVSS Score:

    Affected Products

    Vendor
    Microsoft
    Product
    Windows

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic

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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