Elastic Logstash up to 8.17.5/8.18.0/9.0.0 ssl_verification_mode Hostname certificate validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Elastic Logstash up to 8.17.5/8.18.0/9.0.0. This vulnerability affects unknown code of the component ssl_verification_mode Handler. This manipulation of the argument Hostname causes certificate validation. This vulnerability is handled as CVE-2025-37730. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Elastic Logstash up to 8.17.5/8.18.0/9.0.0 and classified as critical. Affected by this vulnerability is an unknown functionality of the component ssl_verification_mode Handler. The manipulation of the argument hostname with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at discuss.elastic.co. This vulnerability is known as CVE-2025-37730 since 04/16/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

Upgrading to version 8.17.6, 8.18.1 or 9.0.1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (elastic): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Logstash 8.17.6/8.18.1/9.0.1

Timelineinfo

04/16/2025 🔍
05/06/2025 +20 days 🔍
05/06/2025 +0 days 🔍
05/06/2025 +0 days 🔍

Sourcesinfo

Advisory: discuss.elastic.co
Status: Confirmed

CVE: CVE-2025-37730 (🔍)
GCVE (CVE): GCVE-0-2025-37730
GCVE (VulDB): GCVE-100-307651

Entryinfo

Created: 05/06/2025 21:09
Changes: 05/06/2025 21:09 (65)
Complete: 🔍
Cache ID: 216::103

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