CVE-2025-4166

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

Published: May 2, 2025Updated: Dec 31, 2025 Sources: CVE List NVD GHSA BDUCWE-209

4.5MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:HPrivileges Required

High

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:NAvailability

None

Open in CVSS calculator →

Weaknesses

CWE-209

Affected Products

HashiCorp

commercial·USaka hashicorp inc.

VaultSaaSSaaS Service

Cloud & SaaS

Vault EnterpriseSaaSSaaS Service

Cloud & SaaS

Vault Community EditionSaaSSaaS Service

Cloud & SaaS

openbao

oss-project

openbaoOn-prem

Security Products / identity-access-mgmt

package-ecosystem

github.com/hashicorp/vault

OSS Libraries

Novell Inc.

commercial·US

openSUSE TumbleweedOn-prem

Operating Systems / linux-distro

ООО «Ред Софт»

commercial·RUaka red soft

РЕД ОСOn-premOS

Operating Systems / linux-distro

Red Hat Inc.

commercial·USaka red hat

Red Hat Openshift Data FoundationOn-prem

Operating Systems / linux-distro

and 1 more affected products View all →

Exploitability

Official Patch Available

Is your org exposed to CVE-2025-4166?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique

Discovery

View detailed technique mapping

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

discuss.hashicorp.com

https://nvd.nist.gov/vuln/detail/CVE-2025-4166

nvd.nist.gov

https://github.com/hashicorp/vault

github.com

and 5 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-4166 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows