CVE-2021-22144

Name: CVE-2021-22144
Creator: NVD / NIST
Published: 2021-07-26T12:15:08.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.66%

Last modified Jun 17, 2026

CVE-2021-22144 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.66%

73.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-674

Affected Software

Vendor	Product	Versions
Elastic	Elasticsearch	< 6.8.17
Elastic	Elasticsearch	>= 7.0.0, < 7.13.3
Oracle	Communications Cloud Native Core Automated Test Suite	1.8.0

References

https://discuss.elastic.co/t/elasticsearch-7-13-3-and-6-8-17-security-update/278100Release Notes, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210827-0006/Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://discuss.elastic.co/t/elasticsearch-7-13-3-and-6-8-17-security-update/278100Release Notes, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210827-0006/Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory

Timeline

Published: Jul 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22144?

How severe is CVE-2021-22144?

CVE-2021-22144 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22144?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22144?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST