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    CVE-2021-43304

    Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don’t exceed the destination buffer’s limits.

    Published:Mar 14, 2022
    Last Modified:Jun 25, 2025
    EPS:Mar 14, 2022
    EPSS Score:0.00196
    CVSS Score:8.8

    Affected Products

    Vendor
    Clickhouse
    Product
    Clickhouse
    Vendor
    Debian
    Product
    Debian Linux

    Exploits

    https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmshttps://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

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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