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    CVE-2021-3377

    The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient URL sanitization, this feature is affected by a cross-site scripting (XSS) vulnerability. This issue is fixed in v5.0.0.

    Published:Jan 29, 2021
    Last Modified:Nov 3, 2025
    EPS:Mar 5, 2021
    EPSS Score:0.30992
    CVSS Score:6.1

    Affected Products

    Vendor
    Ansi Up Project
    Product
    Ansi Up
    Vendor
    Redhat
    Product
    Acm

    Exploits

    https://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdfhttps://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdf

    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