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CVE-2025-6203

Vault unauthenticated denial of service through complex json payload

HIGH
7.5
CVSS Score
Published: August 28, 2025 at 07:36 PM UTC
Updated: September 26, 2026 at 12:27 AM UTC
1 product affected across 1 vendorVault

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

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

Vault· Hashicorp
95%
1.15.0 ≤ v < 1.16.271.15.0 ≤ v < 1.21.01.15.0 ≤ v < 1.21.21.18.0 ≤ v < 1.18.151.19.0 ≤ v < 1.19.111.20.0 ≤ v < 1.20.51.15.0
Affected range stops below 1.16.27, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.18.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.19.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.20.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.21.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.21.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

7.5HIGHHashiCorp
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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