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    CVE-2017-5637

    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.

    Published:Feb 7, 2017
    Last Modified:Apr 20, 2025
    EPS:Oct 10, 2017
    EPSS Score:0.16885
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Zookeeper
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Redhat
    Product
    Jboss Bpms
    Vendor
    Redhat
    Product
    Jboss Data Virtualization
    Vendor
    Redhat
    Product
    Jboss Enterprise Brms Platform

    Exploits

    https://www.exploit-db.com/exploits/42294

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-12 Choosing Message Identifier
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-147 XML Ping of the Death
    CAPEC-153 Input Data Manipulation
    CAPEC-166 Force the System to Reset Values
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-216 Communication Channel Manipulation
    CAPEC-22 Exploiting Trust in Client
    CAPEC-227 Sustained Client Engagement
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-36 Using Unpublished Interfaces or Functionality
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-492 Regular Expression Exponential Blowup
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-62 Cross Site Request Forgery
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-24308 (CVSS 7.5) — Improper handling of configuration values in ZKConfig in Apache ZooKeeper 3.8.5 and 3.9.4 on all platforms all…
    CVE-2026-24281 (CVSS 7.4) — Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validatio…
    CVE-2025-58457 (CVSS 4.3) — Improper permission check in ZooKeeper AdminServer lets authorized clients to run snapshot and restore command…
    CVE-2024-51504 (CVSS 9.1) — When using IPAuthenticationProvider in ZooKeeper Admin Server there is a possibility of Authentication Bypass …
    CVE-2024-23944 (CVSS 5.3) — Information disclosure in persistent watchers handling in Apache ZooKeeper due to missing ACL check. It allows…
    CVE-2023-44981 (CVSS 9.1) — Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper. If SASL Quorum Peer authen…
    CVE-2021-21295 (CVSS 5.9) — Netty is an open-source, asynchronous event-driven network application framework for rapid development of main…
    CVE-2019-0201 (CVSS 5.9) — An issue is present in Apache ZooKeeper 1.0.0 to 3.4.13 and 3.5.0-alpha to 3.5.4-beta. ZooKeeper’s getACL() co…
    CVE-2018-8012 (CVSS 7.5) — No authentication/authorization is enforced when a server attempts to join a quorum in Apache ZooKeeper before…
    CVE-2016-5017 (CVSS 8.1) — Buffer overflow in the C cli shell in Apache Zookeeper before 3.4.9 and 3.5.x before 3.5.3, when using the "cm…

    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
    https://issues.apache.org/jira/browse/ZOOKEEPER-2693
    https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272%40%3Cissues.activemq.apache.org%3E
    https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3%40%3Ccommits.nifi.apache.org%3E
    https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b%40%3Ccommits.nifi.apache.org%3E
    https://www.oracle.com//security-alerts/cpujul2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html
    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
    https://issues.apache.org/jira/browse/ZOOKEEPER-2693
    https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272%40%3Cissues.activemq.apache.org%3E
    https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3%40%3Ccommits.nifi.apache.org%3E
    https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b%40%3Ccommits.nifi.apache.org%3E
    https://www.oracle.com//security-alerts/cpujul2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High