CVE-2025-6203 (GCVE-0-2025-6203)
Vulnerability from cvelistv5 – Published: 2025-08-28 19:36 – Updated: 2025-10-23 18:18
VLAI
EPSS
VEX
Title
Vault unauthenticated denial of service through complex json payload
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-29 13:36 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| HashiCorp | Vault |
Affected:
1.15.0 , < 1.21.0
(semver)
|
guessed | |
| HashiCorp | Vault Enterprise |
Affected:
1.15.0 , < 1.21.2
(semver)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-6203",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-08-29T13:36:43.373189Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-08-29T13:36:52.434Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"64 bit",
"32 bit",
"x86",
"ARM",
"MacOS",
"Windows",
"Linux"
],
"product": "Vault",
"repo": "https://github.com/hashicorp/vault",
"vendor": "HashiCorp",
"versions": [
{
"lessThan": "1.21.0",
"status": "affected",
"version": "1.15.0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"platforms": [
"64 bit",
"32 bit",
"x86",
"ARM",
"MacOS",
"Windows",
"Linux"
],
"product": "Vault Enterprise",
"repo": "https://github.com/hashicorp/vault",
"vendor": "HashiCorp",
"versions": [
{
"changes": [
{
"at": "1.20.5",
"status": "unaffected"
},
{
"at": "1.19.11",
"status": "unaffected"
},
{
"at": "1.16.27",
"status": "unaffected"
}
],
"lessThan": "1.21.2",
"status": "affected",
"version": "1.15.0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eA 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\u2019s 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.\u003c/p\u003e\u003cbr/\u003e"
}
],
"value": "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\u2019s 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."
}
],
"impacts": [
{
"capecId": "CAPEC-469",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-469: HTTP DoS"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-23T18:18:34.361Z",
"orgId": "67fedba0-ff2e-4543-ba5b-aa93e87718cc",
"shortName": "HashiCorp"
},
"references": [
{
"url": "https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393"
}
],
"source": {
"advisory": "HCSEC-2025-24",
"discovery": "EXTERNAL"
},
"title": "Vault unauthenticated denial of service through complex json payload"
}
},
"cveMetadata": {
"assignerOrgId": "67fedba0-ff2e-4543-ba5b-aa93e87718cc",
"assignerShortName": "HashiCorp",
"cveId": "CVE-2025-6203",
"datePublished": "2025-08-28T19:36:09.870Z",
"dateReserved": "2025-06-17T13:39:36.506Z",
"dateUpdated": "2025-10-23T18:18:34.361Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-6203",
"date": "2026-09-16",
"epss": "0.00699",
"percentile": "0.51436"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-6203\",\"sourceIdentifier\":\"security@hashicorp.com\",\"published\":\"2025-08-28T20:15:43.817\",\"lastModified\":\"2026-06-17T10:01:22.740\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u2019s 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\":[{\"source\":\"security@hashicorp.com\",\"affectedData\":[{\"vendor\":\"HashiCorp\",\"product\":\"Vault\",\"defaultStatus\":\"unaffected\",\"platforms\":[\"64 bit\",\"32 bit\",\"x86\",\"ARM\",\"MacOS\",\"Windows\",\"Linux\"],\"repo\":\"https://github.com/hashicorp/vault\",\"versions\":[{\"version\":\"1.15.0\",\"lessThan\":\"1.21.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"HashiCorp\",\"product\":\"Vault Enterprise\",\"defaultStatus\":\"unaffected\",\"platforms\":[\"64 bit\",\"32 bit\",\"x86\",\"ARM\",\"MacOS\",\"Windows\",\"Linux\"],\"repo\":\"https://github.com/hashicorp/vault\",\"versions\":[{\"version\":\"1.15.0\",\"lessThan\":\"1.21.2\",\"versionType\":\"semver\",\"status\":\"affected\",\"changes\":[{\"at\":\"1.20.5\",\"status\":\"unaffected\"},{\"at\":\"1.19.11\",\"status\":\"unaffected\"},{\"at\":\"1.16.27\",\"status\":\"unaffected\"}]}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@hashicorp.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-08-29T13:36:43.373189Z\",\"id\":\"CVE-2025-6203\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@hashicorp.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"1.15.0\",\"versionEndExcluding\":\"1.16.27\",\"matchCriteriaId\":\"C75B707B-CECA-4F3F-B7A5-3A63627E23E0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:hashicorp:vault:*:*:*:*:-:*:*:*\",\"versionStartIncluding\":\"1.15.0\",\"versionEndExcluding\":\"1.21.0\",\"matchCriteriaId\":\"FFB5EFCB-595D-405C-AEE5-D3A674079A42\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"1.18.0\",\"versionEndExcluding\":\"1.18.15\",\"matchCriteriaId\":\"BB39834B-EF79-4C8B-B344-D81B15652821\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"1.19.0\",\"versionEndExcluding\":\"1.19.11\",\"matchCriteriaId\":\"167CFBBB-E0DF-42AB-84AA-4BF19C3873DB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"1.20.0\",\"versionEndExcluding\":\"1.20.5\",\"matchCriteriaId\":\"466A7DC1-B9A3-4413-AA3E-AFAF34350E52\"}]}]}],\"references\":[{\"url\":\"https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393\",\"source\":\"security@hashicorp.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-27T13:41:05+00:00",
"cve": "CVE-2025-6203",
"id": "CVE-2025-6203",
"initial_release_date": "2025-08-28T19:36:09.870000+00:00",
"product_status:known_affected": "5",
"product_status:known_not_affected": "3",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "github.com/hashicorp/vault: Vault unauthenticated denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-6203.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-07-31T01:22:23Z",
"cve": "CVE-2025-6203",
"id": "CVE-2025-6203",
"initial_release_date": "2025-09-10T23:27:36Z",
"product_status:recommended": "9",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-6203",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-6203.json",
"version": "6"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-6203\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-08-29T13:36:43.373189Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-08-29T13:36:49.616Z\"}}], \"cna\": {\"title\": \"Vault unauthenticated denial of service through complex json payload\", \"source\": {\"advisory\": \"HCSEC-2025-24\", \"discovery\": \"EXTERNAL\"}, \"impacts\": [{\"capecId\": \"CAPEC-469\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-469: HTTP DoS\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/hashicorp/vault\", \"vendor\": \"HashiCorp\", \"product\": \"Vault\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.15.0\", \"lessThan\": \"1.21.0\", \"versionType\": \"semver\"}], \"platforms\": [\"64 bit\", \"32 bit\", \"x86\", \"ARM\", \"MacOS\", \"Windows\", \"Linux\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/hashicorp/vault\", \"vendor\": \"HashiCorp\", \"product\": \"Vault Enterprise\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"1.20.5\", \"status\": \"unaffected\"}, {\"at\": \"1.19.11\", \"status\": \"unaffected\"}, {\"at\": \"1.16.27\", \"status\": \"unaffected\"}], \"version\": \"1.15.0\", \"lessThan\": \"1.21.2\", \"versionType\": \"semver\"}], \"platforms\": [\"64 bit\", \"32 bit\", \"x86\", \"ARM\", \"MacOS\", \"Windows\", \"Linux\"], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://discuss.hashicorp.com/t/hcsec-2025-24-vault-denial-of-service-though-complex-json-payloads/76393\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\\u2019s 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eA 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\\u2019s 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.\u003c/p\u003e\u003cbr/\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"67fedba0-ff2e-4543-ba5b-aa93e87718cc\", \"shortName\": \"HashiCorp\", \"dateUpdated\": \"2025-10-23T18:18:34.361Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-6203\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-23T18:18:34.361Z\", \"dateReserved\": \"2025-06-17T13:39:36.506Z\", \"assignerOrgId\": \"67fedba0-ff2e-4543-ba5b-aa93e87718cc\", \"datePublished\": \"2025-08-28T19:36:09.870Z\", \"assignerShortName\": \"HashiCorp\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…