Skip to content
Fencer Vulns
high 7.5

CVE-2025-6203 json

Vault unauthenticated denial of service through complex json payload

published 2025-08-28 14 mo ago modified 2026-09-26 44 d ago also BIT-vault-2025-6203 , EUVD-2025-26143 , GHSA-8f82-53h8-2p34 , GO-2025-3924

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/hashicorp/vault 1.20.3
  • bitnami vault 1.20.3
  • HashiCorp Vault 1.21.0
  • HashiCorp Vault Enterprise 1.16.27, 1.19.11, 1.20.5, 1.21.2
  • govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20250918T182144-150000.1.107.1

suse advisories SUSE-SU-2025:03289-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • openbao openSUSE Tumbleweed 2.4.1-1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250908T141310-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15579-1openSUSE-SU-2025:15538-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-6203 updated cvss 5.3

github.com/hashicorp/vault: Vault unauthenticated denial of service

  • Red Hat cert-manager Operator for Red Hat OpenShift cert-manager-operator-rhel9, jetstack-cert-manager-rhel9, jetstack-cert-manager-acmesolver-rhel9 Red Hat external secrets operator for Red Hat OpenShift - Tech Preview external-secrets-operator-rhel9 Red Hat Trusted Artifact Signer client-server-rhel9
    affected: workaround, no fix available
  • Red Hat Openshift Data Foundation 4 odf4/cephcsi-rhel9, odf4/mcg-cli-rhel9, odf4/mcg-rhel9-operator
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
14 mo ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/hashicorp/vault
<1.20.3
1.20.3
bitnami vault
>=1.15.0, <1.20.3
1.20.3

Affected products

  • HashiCorp Vault
  • HashiCorp Vault Enterprise

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.