How severe is CVE-2025-6203?

CVE-2025-6203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-6203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6203?

CVE-2025-6203 primarily affects Hashicorp Vault. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-6203?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-6203 have an EU (EUVD) identifier?

Yes. CVE-2025-6203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26143.

When was CVE-2025-6203 published?

CVE-2025-6203 was published on 2025-08-28 and last updated on 2026-06-17.

CVE-2025-6203

CVE-2025-6203 is a high-severity vulnerability in Hashicorp Vault with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26143
Weakness: CWE-770
Affected product: Hashicorp Vault
Published: 2025-08-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-6203?: 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.
How severe is CVE-2025-6203?: CVE-2025-6203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-6203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6203?: CVE-2025-6203 primarily affects Hashicorp Vault. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-6203?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-6203 have an EU (EUVD) identifier?: Yes. CVE-2025-6203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26143.
When was CVE-2025-6203 published?: CVE-2025-6203 was published on 2025-08-28 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:hashicorp:vault:*:*:*:*:-:*:*:*

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