CVE-2021-22144

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-26 · updated 2026-06-17
Weakness: CWE-674

Description

In Elasticsearch versions before 7.13.3 and 6.8.17 an uncontrolled recursion vulnerability that could lead to a denial of service attack was identified in the Elasticsearch Grok parser. A user with the ability to submit arbitrary queries to Elasticsearch could create a malicious Grok query that will crash the Elasticsearch node.

Affected products

Elasticsearch: before 6.8.17; from 7.0.0 before 7.13.3 — fixed in 6.8.17, 7.13.3
Oracle Communications Cloud Native Core Automated Test Suite: 1.8.0

How to fix

Upgrade to a fixed version: Elasticsearch 6.8.17, 7.13.3. Check the vendor advisory for mitigations.

References

https://discuss.elastic.co/t/elasticsearch-7-13-3-and-6-8-17-security-update/278100
https://security.netapp.com/advisory/ntap-20210827-0006/
https://www.oracle.com/security-alerts/cpuapr2022.html
https://discuss.elastic.co/t/elasticsearch-7-13-3-and-6-8-17-security-update/278100
https://security.netapp.com/advisory/ntap-20210827-0006/
https://www.oracle.com/security-alerts/cpuapr2022.html

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