What is CVE-2025-37727?

CVE-2025-37727 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.7/10. Published 2025-10-10.

How severe is CVE-2025-37727?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Information disclosure in Elastic Elasticsearch

CVE-2025-37727

Insertion of sensitive information in log file in Elasticsearch can lead to loss of confidentiality under specific preconditions when auditing requests to the reindex API https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-reindex

Published 2025-10-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (14.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Elastic Elasticsearch — versions 7.0.0, 8.0.0, 8.19.0

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

discuss.elastic.co/t/elasticsearch-8-18-8-8-19-5-9-0-8-9-1-5-security-update-es… (Vendor Advisory)

Frequently asked questions

What is CVE-2025-37727?: CVE-2025-37727 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Insertion of Sensitive Information into Log File. CVSS score: 5.7/10. Published 2025-10-10.
How severe is CVE-2025-37727?: Medium severity. CVSS v3 base score is 5.7 out of 10.