CVE-2017-5637

mediumpriority · attend · 66OT risk · highEPSS 0.731 · 99 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

73.1% (99th) EPSS

CVSS 5 · medium

Is it mine?

35 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-22

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-306USprimaryCWE-400USprimaryCWE-306USCWE-399USCWE-400USCWE-400US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-42294Zookeeper 3.5.2 Client - Denial of ServicePoC · exploit_db

affected products (35)

Products and version ranges known to be affected.

EMC Avamarall versionscert_bundDEcpe:/a:emc:avamar:-
Hitachi Ops Centerall versionscert_bundDEcpe:/a:hitachi:ops_center:-
Hitachi Ops Center <Analyzer 10.9.3-00all versionscert_bundDE
Hitachi Ops Center <Viewpoint 10.9.3-00all versionscert_bundDE
IBM DB2 11.1all versionscert_bundDEcpe:/a:ibm:db2:11.1
IBM DB2 11.5all versionscert_bundDEcpe:/a:ibm:db2:11.5
IBM SPSS Analytic Serverall versionscert_bundDEcpe:/a:ibm:spss:analytic_server
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Hitachi Ops Center< Analyzer 10.9.3-00cert_bundDE
Hitachi Ops Center< Viewpoint 10.9.3-00cert_bundDE
Apache Software Foundation Apache ZooKeeper≤ 3.4.0 to 3.4.9enisa_euvdEU
Apache Software Foundation Apache ZooKeeper≤ 3.5.0 to 3.5.2enisa_euvdEU
Apache Software Foundation ZooKeeper3.4.9 → 3.5.3fstec_bduRU
Oracle Corp. Siebel Core - Server Framework21.0 → 21.5fstec_bduRU
Red Hat Inc. Red Hat JBoss BPM Suite≤ 6.4.7fstec_bduRU
Red Hat Inc. Red Hat JBoss BRMS≤ 6.4.7fstec_bduRU
Red Hat Inc. Red Hat JBoss Data Virtualization6.3 → 7fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 8fstec_bduRU
apache zookeeper= 3.4.0nvdUScpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*

showing 20 of 35

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-0770IBM DB2: Mehrere SchwachstellenDeutsch2020-04-23csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in IBM DB2 ausnutzen, um seine Privilegien zu erhöhen oder einen Denial of Service zu verursachen
GHSA-7cwj-j333-x7f7Uncontrolled Resource Consumption in Apache ZooKeeper2022-05-13ghsa · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2017-10-10modified 2026-06-17

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references (44)

External citations — patches, advisories, analysis.

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