Back
CVE-2017-5637
Two four letter word commands "wchp/wchc" are CPU intensive and could cause spike of CPU utilization on Apache ZooKeeper server if abused,…
High7.5EPSS 73.1%
- Published
- Updated
- Reserved
- Assigned by
- apache
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 73.1% · top 0.5% of all CVEs (3 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Apache Software Foundation · Apache ZooKeeper
- affected 3.4.0 to 3.4.9
- affected 3.5.0 to 3.5.2
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.apache.zookeeper:zookeeperGHSA-7cwj-j333-x7f7 (opens in a new tab)
References (12)
- [dev] 20171009 [SECURITY] CVE-2017-5637: DOS attack on wchp/wchc four letter words (4lw) (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 98814 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- RHSA-2017:3355 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:3354 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:2477 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- DSA-3871 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [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-8.0.53.jar, zookeeper-3.4.6.jar, guava-18.0.jar, jetty-all-9.2.26.v20180806.jar, scala-library-2.11.0.jar (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [nifi-commits] 20191113 svn commit: r1869773 - /nifi/site/trunk/security.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [nifi-commits] 20200123 svn commit: r1873083 - /nifi/site/trunk/security.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.oracle.com/security-alerts/cpujul2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://issues.apache.org/jira/browse/ZOOKEEPER-2693 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com//security-alerts/cpujul2021.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7cwj-j333-x7f7 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2017-5637)Record last updated .