CVE-2025-37730

Logstash Improper Certificate Validation in TCP output

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Affected: Elastic Logstash
Published at:
Updated at:

References

Link Tags
https://discuss.elastic.co/t/logstash-8-17-6-8-18-1-and-9-0-1-security-update-esa-2025-08/377869

Frequently Asked Questions

What is the severity of CVE-2025-37730?
CVE-2025-37730 has been scored as a medium severity vulnerability.
How to fix CVE-2025-37730?
To fix CVE-2025-37730, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-37730 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-37730 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-37730?
CVE-2025-37730 affects Elastic Logstash.
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