Uncontrolled Resource Consumption in Apache ZooKeeper
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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.zookeeper:zookeeper | >= 3.4.0, < 3.4.10, >= 3.5.0, < 3.5.3 | 3.4.10, 3.5.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2017-5637
- 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
- https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272@%3Cissues.activemq.apache.org%3E
- https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370@%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3@%3Ccommits.nifi.apache.org%3E
- https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b@%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
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- Java / Kotlin (Maven)
- Package
org.apache.zookeeper:zookeeper- Disclosed
- 13.05.2022
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7cwj-j333-x7f7 - CC BY 4.0
Vulnerability history: org.apache.zookeeper:zookeeper
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 9
- First → latest
- 05.2019 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 5
- Medium 3
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 2
- 2023: 1
- 2024: 2
- 2025: 1
- 2026: 2
-
Uncontrolled Resource Consumption in Apache ZooKeeper this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.