What is CVE-2021-22145?

CVE-2021-22145 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Information Disclosure. CVSS score: 6.5/10. Published 2021-07-21.

How severe is CVE-2021-22145?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2021-22145 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Elastic Elasticsearch

CVE-2021-22145

A memory disclosure vulnerability was identified in Elasticsearch 7.10.0 to 7.13.3 error reporting. A user with the ability to submit arbitrary queries to Elasticsearch could submit a malformed query that would result in an error message returned containing previously used portions of a data buffer. This buffer could contain sensitive information such as Elasticsearch documents or authentication details.

Vulnerability class: Information Disclosure

Published 2021-07-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.762 (99.5th percentile), scored 2026-10-17.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.762 · newest: 0.762 · change: 0.000

Affected products

Elastic Elasticsearch — versions 7.10.0
Oracle Communications Cloud Native Core Automated Test Suite — versions 1.8.0

Weakness classification (CWE)

Public proof-of-concept exploits

References

www.oracle.com/security-alerts/cpuapr2022.html (Patch, Third Party Advisory)
security.netapp.com/advisory/ntap-20210827-0006/ (Third Party Advisory)
discuss.elastic.co/t/elasticsearch-7-13-4-security-update/279177 (Vendor Advisory)
packetstormsecurity.com/files/163648/ElasticSearch-7.13.3-Memory-Disclosure.html (Exploit, VDB Entry, Third Party Advisory)
gist.github.com/lucasdrufva/f9c5d7c9e26ee087b736d727953afd34 (technical-description)

Frequently asked questions

What is CVE-2021-22145?: CVE-2021-22145 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Information Disclosure. CVSS score: 6.5/10. Published 2021-07-21.
How severe is CVE-2021-22145?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-22145 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.