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CVE-2025-4166: Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin
4.5
CVSS
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.
Classification
CVE ID: CVE-2025-4166
CVSS Base Severity: MEDIUM
CVSS Base Score: 4.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Affected Products
Vendor: HashiCorp
Product: Vault, Vault Enterprise
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 7.16% (scored less or equal to compared to others)
EPSS Date: 2025-05-31 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-4166https://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin