CVE-2021-43305

    Dashboard / Vulnerabilities / CVE-2021-43305

    CVE-2021-43305

    Published: 14 Mar 2022Last Modified: 24 Oct 2026

    Summary:

    Details: 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. This issue is very similar to CVE-2021-43304, but the vulnerable copy operation is in a different wildCopy call.

    References: https://lists.debian.org/debian-lts-announce/2022/11/msg00002.html, https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -5adad0ff121319c172eae302bcef8b67b305557f

    Affected versions

    v21.10.1.8009-testing
    v21.10.1.8013-testing
    v21.10.1.8013-prestable
    v21.10.1.8002-testing
    v21.10.1.7998-testing
    v21.10.1.7939-testing
    v21.10.1.7933-testing
    v21.10.1.7926-testing
    v21.10.1.7892-testing
    v21.10.1.7906-testing
    v21.10.1.7859-testing
    v21.10.1.7856-testing
    v21.10.1.7829-testing
    v21.10.1.7848-testing
    v21.10.1.7845-testing

    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
    CVE-2021-43305 | CVE-DB