CVE-2025-6203

Vault unauthenticated denial of service through complex json payload

State: Published
Severity: 7.5 High
Published: Aug 28, 2025
Updated: Oct 23, 2025
Reserved: Jun 17, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	HashiCorp

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
VaultHashiCorp	1.15.0 to before 1.21.0Affected
Vault EnterpriseHashiCorp	1.15.0 to before 1.21.2Affectedfrom 1.20.5Not affectedfrom 1.19.11Not affectedfrom 1.16.27Not affected

References

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

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