{"id":"CVE-2017-5637","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.","aliases":["GHSA-7cwj-j333-x7f7"],"modified":"2026-07-08T05:50:03.912671209Z","published":"2017-10-10T01:30:22.360Z","related":["SUSE-SU-2020:1066-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"8.0"},{"last_affected":"8.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux","cpes":["cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"]}]},"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272%40%3Cissues.activemq.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370%40%3Cdev.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3%40%3Ccommits.nifi.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b%40%3Ccommits.nifi.apache.org%3E"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"ADVISORY","url":"http://www.debian.org/security/2017/dsa-3871"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/98814"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2477"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3354"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3355"},{"type":"REPORT","url":"https://issues.apache.org/jira/browse/ZOOKEEPER-2693"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/zookeeper","events":[{"introduced":"2109aca0fa091222434a8895e2533a26b770ad05"},{"last_affected":"3f572f0a3568ad21d7a1175ecde007b222c74cf4"}],"database_specific":{"cpe":["cpe:2.3:a:apache:zookeeper:3.4.0:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.1:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.2:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.3:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.4:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.5:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.6:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.7:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.8:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.4.9:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.5.0:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.5.1:*:*:*:*:*:*:*","cpe:2.3:a:apache:zookeeper:3.5.2:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.4.0"},{"last_affected":"3.4.0"},{"introduced":"3.4.1"},{"last_affected":"3.4.1"},{"introduced":"3.4.2"},{"last_affected":"3.4.2"},{"introduced":"3.4.3"},{"last_affected":"3.4.3"},{"introduced":"3.4.4"},{"last_affected":"3.4.4"},{"introduced":"3.4.5"},{"last_affected":"3.4.5"},{"introduced":"3.4.6"},{"last_affected":"3.4.6"},{"introduced":"3.4.7"},{"last_affected":"3.4.7"},{"introduced":"3.4.8"},{"last_affected":"3.4.8"},{"introduced":"3.4.9"},{"last_affected":"3.4.9"},{"introduced":"3.5.0"},{"last_affected":"3.5.0"},{"introduced":"3.5.1"},{"last_affected":"3.5.1"},{"introduced":"3.5.2"},{"last_affected":"3.5.2"}],"source":"CPE_STRING"}}],"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","3.5.0","3.5.1","3.5.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-5637.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}