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CVE-2025-37730— Logstash Improper Certificate Validation in TCP output

Quick assessment

Affected
Elastic Logstash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Logstash是荷兰Elastic公司的一套日志分析和监控工具。 Elastic Logstash 9.0.1之前版本存在安全漏洞，该漏洞源于证书验证不当，可能导致中间人攻击。

CVSS 6.5 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-37730

Vulnerability Information
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Vulnerability Title
Logstash Improper Certificate Validation in TCP output
Source: CVE Program / CVE List V5
Vulnerability Description
Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Logstash 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Logstash是荷兰Elastic公司的一套日志分析和监控工具。 Elastic Logstash 9.0.1之前版本存在安全漏洞，该漏洞源于证书验证不当，可能导致中间人攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Logstash 8.0.0 ~ 8.17.6 -

II. Public POCs for CVE-2025-37730

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III. Intelligence Information for CVE-2025-37730

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Other References for CVE-2025-37730 (1)

IV. Related Vulnerabilities

Same product: Logstash
Same vendor: Elastic
Same weakness: CWE-295

V. Comments for CVE-2025-37730

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