How severe is CVE-2025-37730?

CVE-2025-37730 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2025-37730 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-37730?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-37730 have an EU (EUVD) identifier?

Yes. CVE-2025-37730 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13629.

When was CVE-2025-37730 published?

CVE-2025-37730 was published on 2025-05-06 and last updated on 2026-06-17.

CVE-2025-37730

CVE-2025-37730 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13629
Weakness: CWE-295
Published: 2025-05-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-37730?: 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.
How severe is CVE-2025-37730?: CVE-2025-37730 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2025-37730 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-37730?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-37730 have an EU (EUVD) identifier?: Yes. CVE-2025-37730 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13629.
When was CVE-2025-37730 published?: CVE-2025-37730 was published on 2025-05-06 and last updated on 2026-06-17.

References

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

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