CVE-2025-6203

HIGH

HashiCorp Vault 1.15.0-1.16.26, 1.17.0-1.20.2 - Denial of Service via Complex JSON Payloads

Title source: llm

Description

A malicious user may submit a specially-crafted complex payload that otherwise meets the default request size limit which results in excessive memory and CPU consumption of Vault. This may lead to a timeout in Vault’s auditing subroutine, potentially resulting in the Vault server to become unresponsive. This vulnerability, CVE-2025-6203, is fixed in Vault Community Edition 1.20.3 and Vault Enterprise 1.20.3, 1.19.9, 1.18.14, and 1.16.25.

References (1)

Core 1

Core References

Vendor Advisory

https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393

Scores

CVSS v3 7.5

EPSS 0.0013

EPSS Percentile 32.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-770

Status published

Products (3)

hashicorp/vault 0 - 1.20.3Go

hashicorp/vault 1.15.0 - 1.16.27

hashicorp/vault 1.15.0 - 1.21.0

Published Aug 28, 2025

Tracked Since Feb 18, 2026