What is CVE-2025-37731?

CVE-2025-37731 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Improper Authentication. CVSS score: 6.8/10. Published 2025-12-15.

How severe is CVE-2025-37731?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Elastic Elasticsearch

CVE-2025-37731

Improper Authentication in Elasticsearch PKI realm can lead to user impersonation via specially crafted client certificates. A malicious actor would need to have such a crafted client certificate signed by a legitimate, trusted Certificate…

Vulnerability class: Broken Authentication

EPSS: 0.000 (11.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Elastic Elasticsearch — versions 7.0.0, 8.0.0, 9.0.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

discuss.elastic.co/t/elasticsearch-8-19-8-9-1-8-and-9-2-2-security-update-esa-2…

Frequently asked questions

What is CVE-2025-37731?: CVE-2025-37731 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Improper Authentication. CVSS score: 6.8/10. Published 2025-12-15.
How severe is CVE-2025-37731?: Medium severity. CVSS v3 base score is 6.8 out of 10.