CVE-2025-37730

mediumpriority · track · 0EPSS 0.002 · 7 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.18% (7th) EPSS

CVSS 6.5 · medium

Is it mine?

11 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · osv

EPSS · scored 2026-10-21

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · security@elastic.coexploitability 2.2 · impact 4.2

v3.16mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295US

affected products (11)

Products and version ranges known to be affected.

Open Source LogStash <8.17.6all versionscert_bundDE
Open Source LogStash <8.18.1all versionscert_bundDE
Open Source LogStash <9.0.1all versionscert_bundDE
Open Source LogStash< 8.17.6cert_bundDE
Open Source LogStash< 8.18.1cert_bundDE
Open Source LogStash< 9.0.1cert_bundDE
Elastic Logstash8.0.0 → 8.17.6enisa_euvdEU
Elastic Logstash8.18.0 → 8.18.1enisa_euvdEU
Elastic Logstash9.0.0 → 9.0.1enisa_euvdEU
Bitnami logstash8.0.0 → 8.18.1osvUSpkg:bitnami/logstash
Bitnami logstash9.0.0 → 9.0.1osvUSpkg:bitnami/logstash

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-0952LogStash: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2025-05-06csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in LogStash ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
BIT-logstash-2025-37730Logstash Improper Certificate Validation in TCP output2025-05-08vendor · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund osv NVD CVE.org MITRE

published 2025-05-06modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan