CVE & CISA-KEV Catalog

CVE-2017-5637

HIGHEPSS 99th pctl
7.5
CVSS v3
NVD

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-306Missing Authentication for Critical FunctionCWE-400Resource Exhaustion

How to fix

Remediation Available
zookeeperDebian
Fixed in:3.4.9-3CVE-2017-5637
Fixed in:3.4.9-3CVE-2017-5637
Fixed in:3.4.9-3CVE-2017-5637
Fixed in:3.4.9-3CVE-2017-5637
libzookeeper-javaUbuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
libzookeeper-mt2Ubuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
libzookeeper-st2Ubuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
libzookeeper2Ubuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
python-zookeeperUbuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
zookeeperUbuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
zookeeper-binUbuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1
zookeeperdUbuntu
Fixed in:3.4.5+dfsg-1ubuntu0.1~esm1USN-4789-1
Fixed in:3.4.8-1ubuntu0.1~esm1USN-4789-1

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

73.65%probability of exploitation in 30 days
99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory2

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2017-10271High7.5100%KEV + Ransom-
CVE-2025-3248Critical9.8100%KEV + RansomFix
CVE-2023-42793Critical9.8100%KEV + RansomFix
CVE-2022-1388Critical9.8100%KEV + RansomFix
CVE-2021-37415Critical9.8100%KEV-
CVE-2023-21839High7.5100%KEV-
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.