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CVE-2025-6203

Vault unauthenticated denial of service through complex json payload

Published: Aug 28, 2025Updated: Dec 18, 2025 Sources: CVE List NVD GHSA BDUCWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.7%
Top 51.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-770

Affected Products

РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Vault Community EditionHashiCorp
On-prem
Cloud & SaaS / api-gateway
Vault EnterpriseHashiCorp
SaaSSaaS Service
Cloud & SaaS
vaulthashicorp
SaaSSaaS Service
Cloud & SaaS
github.com/hashicorp/vaultGoOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
hashicorpcommercialUSCloud & SaaSaka hashicorp inc.
gopackage-ecosystemOSS Libraries
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393
discuss.hashicorp.com
https://redos.red-soft.ru/support/secure/uyazvimosti/uyazvimost-vault-cve-2025-6203/?sphrase_id=1326994
redos.red-soft.ru
https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393
discuss.hashicorp.com
and 4 more references View all →

Timeline

Published
Aug 28, 2025
Last Updated
Dec 18, 2025

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