CVE-2025-4166

Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin

MEDIUM

6.5

CVSS Score

Published: May 2, 2025 at 02:57 PM UTC

Updated: June 17, 2026 at 09:32 AM UTC

2 products affected across 2 vendorsVaultOpenbao

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vault · Hashicorp

95%

0.10.0 ≤ v < 1.19.20.3.0 ≤ v < 1.16.200.3.0 ≤ v < 1.19.20.3.0 ≤ v < 1.19.31.17.0 ≤ v < 1.17.161.18.0 ≤ v < 1.18.91.19.0 ≤ v < 1.19.30.10.0 0.3.0

Affected range stops below 1.16.20, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.17.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.18.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.19.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.19.3, so it looks safe — our inference, not a vendor statement

Openbao · Openbao

95%

v < 2.2.2

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory 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

References (1)

Vendor Advisory

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-209

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