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    CVE-2003-1564

    libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack."

    Published:Feb 2, 2003
    Last Modified:Apr 16, 2026
    EPS:Sep 2, 2008
    EPSS Score:0.00646
    CVSS Score:6.5

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Xmlsoft
    Product
    Libxml2

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-197 Exponential Data Expansion

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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