Uncontrolled Resource Consumption in Apache ZooKeeper
Published Oct 10, 2017 · Updated Oct 22, 2026 · Also known as GHSA-7cwj-j333-x7f7
Original summary
Normalized public record · Updated Oct 22, 2026
Uncontrolled Resource Consumption in Apache ZooKeeper
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- HIGH
- Confidence
- 45%
- Aliases
- GHSA-7cwj-j333-x7f7
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- [dev] 20171009 [SECURITY] CVE-2017-5637: DOS attack on wchp/wchc four letter words (4lw) ↗
- 98814 ↗
- RHSA-2017:3355 ↗
- RHSA-2017:3354 ↗
- RHSA-2017:2477 ↗
- DSA-3871 ↗
- [activemq-issues] 20190820 [jira] [Created] (AMQ-7279) Security Vulnerabilities in Libraries - jackson-databind-2.9.8.jar, tomcat-servlet-api-8.0.53.jar, tomcat-websocket-api-8.0.5 ↗
- [nifi-commits] 20191113 svn commit: r1869773 - /nifi/site/trunk/security.html ↗
- [nifi-commits] 20200123 svn commit: r1873083 - /nifi/site/trunk/security.html ↗
- www.oracle.com ↗
- issues.apache.org ↗
- www.oracle.com ↗
Record history
Published Oct 10, 2017 · Last refreshed Oct 22, 2026