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CVE-2017-5637 Apache ZooKeeper

Affected softwareApache ZooKeeper
Severity7.5 High CVSS 3.0 2 scores
Fixed in3.4.10, 3.5.3
WeaknessMissing authentication (CWE-306)
Published10 Oct 2017
Updated17 Jun 2026

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.

CWE-400 · Uncontrolled resource consumption

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in Exploit-DB; first seen 2017-07-02.
  • EPSS 73% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.
IndexArtifactStarsFirst seen
Exploit-DB Zookeeper 3.5.2 Client - Denial of Service 2017-07-02

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

7.5 HIGH v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update July 2021 ↗ CPU 2021-Q3 Oracle Siebel CRM / Cloud Gateway (Zookeeper) (21.5 and Prior)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Siebel CRM Cloud Gateway (Zookeeper) 21.5 and Prior

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.zookeeper:zookeeper 3.4.0 3.4.10 unbounded
org.apache.zookeeper:zookeeper 3.5.0 3.5.3 unbounded

Products and versions

3 products, 16 version entries
SourceVendorProductSchemeAffected versions
nvd apache zookeeper generic 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
nvd debian debian linux generic 8.0
osv org.apache.zookeeper zookeeper generic ≥ 3.4.0 and < 3.4.10 · ≥ 3.5.0 and < 3.5.3

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** HTTP, CLOUD GATEWAY (ZOOKEEPER), NO AUTH REMOTE EXPLOIT **Products:** SIEBEL CORE - SERVER FRAMEWORK, ORACLE SIEBEL CRM

References

URLTags
https://access.redhat.com/errata/RHSA-2017:2477 WEB
https://access.redhat.com/errata/RHSA-2017:3354 WEB
https://access.redhat.com/errata/RHSA-2017:3355 WEB
https://issues.apache.org/jira/browse/ZOOKEEPER-2693 WEB
https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272@%3Cissues.activemq.apache.org%3E WEB
https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370@%3Cdev.zookeeper.apache.org%3E WEB
https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3@%3Ccommits.nifi.apache.org%3E WEB
https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b@%3Ccommits.nifi.apache.org%3E WEB
https://www.oracle.com//security-alerts/cpujul2021.html WEB
https://www.oracle.com/security-alerts/cpujul2020.html WEB

Timeline

Published2017-10-10By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.