CVE-2025-6203: Hashicorp Vault

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Hashicorp Vault: from 1.15.0, before 1.16.27 (fixed in 1.16.27); from 1.15.0, before 1.21.0 (fixed in 1.21.0); from 1.18.0, before 1.18.15 (fixed in 1.18.15); from 1.19.0, before 1.19.11 (fixed in 1.19.11); from 1.20.0, before 1.20.5 (fixed in 1.20.5)

Published 2025-08-28. Last modified 2026-09-26.