High severity · published Dec 15, 2025
CVE-2025-37731
Improper Authentication in Elasticsearch PKI realm can lead to user impersonation via specially crafted client certificates
7.4
CVSS
0.2%
EPSS
No
On KEV
Description
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 Authority.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Elasticsearch · Elastic
7.0.0 through 7.17.29; 8.0.0 before 8.19.8; 9.0.0 before 9.1.8; 9.2.0 before 9.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-37731
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-37731
Vendor Advisory
https://discuss.elastic.co/t/elasticsearch-8-19-8-9-1-8-and-9-2-2-security-update-esa-2025-27/384063
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