CVE-2017-5637 EXPLOIT
7.5
HIGH · CVSS 3.0 · EPSS 73.1% (pctl 99)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.5 (HIGH, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| EPSS | 73.06% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-306 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2017-10-10 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| apache | zookeeper |
| debian | debian linux |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Zookeeper 3.5.2 Client - Denial of Service | 2017-07-02 |
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
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