No exploitation reportedFix available

CVE-2021-22144

Q: Is CVE-2021-22144 actively exploited?

Active exploitation of CVE-2021-22144 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-22144?

CVE-2021-22144 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-07-26
Fixed in7.13.3 · 6.8.17
WeaknessCWE-674

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2021-07-2612:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-22144?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22144?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Elasticsearch

Branch	Affected	Fixed in	Source
7.x	≥ 7.0.0, < 7.13.3	7.13.3	NVD · OSV
7.x	≥ 7.0.0-alpha1, < 7.13.3	7.13.3	OSV
6.8	< 6.8.17	6.8.17	NVD · OSV

Oracle communications cloud native core automated test suite

Branch	Affected	Fixed in	Source
1.8	= 1.8.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Elasticsearch to 7.13.3 · 6.8.17

Advisories and patches

discuss.elastic.coRelease Notes · Vendor Advisory
www.oracle.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04read 2026-10-23
NVDweakness (CWE)CWE-674read 2026-10-23
FIRST EPSSEPSS score2.4 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: 2021-07-26
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-22144?

Is CVE-2021-22144 actively exploited?

Active exploitation of CVE-2021-22144 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22144?

CVE-2021-22144 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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