Medium severity · published May 2, 2025
CVE-2025-4166
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…
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Openbao · Openbao
before 2.2.2 · source: NVD
VA
Vault · Hashicorp
0.3.0 before 1.16.20; 0.3.0 before 1.19.3; 1.17.0 before 1.17.16; 1.18.0 before 1.18.9; 1.19.0 before 1.19.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-4166
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-4166
Vendor Advisory
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
More from Vault
9.8
CVE-2024-2048
Vault and Vault Enterprise (“Vault”) TLS certificate auth method did not correctly validate client certificates when configured with a non-CA certificate as trusted certificate
9.8
CVE-2020-35192
The official vault docker images before 0.11.6 contain a blank password for a root user
9.8
CVE-2020-12757
HashiCorp Vault and Vault Enterprise 1.4.0 and 1.4.1, when configured with the GCP Secrets Engine, may incorrectly generate GCP Credentials with the default time-to-live lease…
9.1
CVE-2025-6000
A privileged Vault operator within the root namespace with write permission to {{sys/audit}} may obtain code execution on the underlying host if a plugin directory is set in…
9.1
CVE-2022-40186
An issue was discovered in HashiCorp Vault and Vault Enterprise before 1.11.3