CVE-2025-4166 | BDVDB-2026-277228 Detail

HashiCorpVault

Description#

Vault Community and Vault Enterprise Key/Value (kv) Version 2 plugin may unintentionally expose sensitive information in server and audit logs when users submit malformed payloads during secret creation or update operations via the Vault REST API. This vulnerability, identified as CVE-2025-4166, is fixed in Vault Community 1.19.3 and Vault Enterprise 1.19.3, 1.18.9, 1.17.16, 1.16.20.

Impact#

CAPEC-215: Fuzzing for application mapping

Weaknesses#

CWE-209 Generation of Error Message Containing Sensitive Information

References#

https://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin

Exploit#

No public exploit known

History#

Version 12025-05-02Record published in the CVE List.
Version 22025-05-08Most recent update recorded in the CVE List.

Published

Published: 2025-05-02
Last modified: 2025-05-08

Vendor information

Vendor: HashiCorp
Product: Vault

All HashiCorp vulnerabilities

Score

4.5 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 39.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 0.3.0 and < 1.19.2
Fixed
1.19.2

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.5 Medium

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).