{"cve":"CVE-2017-5637","nvd":{"published":"2017-10-10T01:30:22.360","modified":"2026-06-17T01:20:53.820","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-306","CWE-400"],"references":["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"],"products":["apache:zookeeper","debian:debian_linux"],"source":"nvd","synced_at":"2026-10-19T20:46:01.145313090+00:00"},"epss":{"cve":"CVE-2017-5637","score":0.73064,"percentile":0.99455,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7cwj-j333-x7f7","url":"https://osv.dev/vulnerability/GHSA-7cwj-j333-x7f7","summary":"Uncontrolled Resource Consumption in Apache ZooKeeper","modified":"2023-11-08T03:59:22.246576Z","packages":[{"ecosystem":"Maven","name":"org.apache.zookeeper:zookeeper","purl":"pkg:maven/org.apache.zookeeper/zookeeper","ranges":[">=3.4.0 <3.4.10"],"fixed":["3.4.10"]},{"ecosystem":"Maven","name":"org.apache.zookeeper:zookeeper","purl":"pkg:maven/org.apache.zookeeper/zookeeper","ranges":[">=3.5.0 <3.5.3"],"fixed":["3.5.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}