CVE-2017-5637

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    CVE-2017-5637

    Published: 10 Oct 2017Last Modified: 8 Jul 2026

    Summary:

    Details: Two four letter word commands "wchp/wchc" are CPU intensive and could cause spike of CPU utilization on Apache ZooKeeper server if abused, which leads to the server unable to serve legitimate client requests. Apache ZooKeeper thru version 3.4.9 and 3.5.2 suffer from this issue, fixed in 3.4.10, 3.5.3, and later.

    References: https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272%40%3Cissues.activemq.apache.org%3E, https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370%40%3Cdev.zookeeper.apache.org%3E, https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3%40%3Ccommits.nifi.apache.org%3E, https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b%40%3Ccommits.nifi.apache.org%3E, https://www.oracle.com//security-alerts/cpujul2021.html, https://www.oracle.com/security-alerts/cpujul2020.html, http://www.debian.org/security/2017/dsa-3871, http://www.securityfocus.com/bid/98814, https://access.redhat.com/errata/RHSA-2017:2477, https://access.redhat.com/errata/RHSA-2017:3354, https://access.redhat.com/errata/RHSA-2017:3355, https://issues.apache.org/jira/browse/ZOOKEEPER-2693

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 2109aca0fa091222434a8895e2533a26b770ad05
    Fixed -None

    Affected versions

    3.4.0
    3.4.1
    3.4.2
    3.4.3
    3.4.4
    3.4.5
    3.4.6
    3.4.7
    3.4.8
    3.4.9

    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-2017-5637 | CVE-DB