{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33521", "assignerOrgId": "cedc17bb-4939-4f40-a1f4-30ae8af1094e", "state": "PUBLISHED", "assignerShortName": "Esri", "dateReserved": "2026-03-20T17:25:24.410Z", "datePublished": "2026-10-26T18:07:20.638Z", "dateUpdated": "2026-10-26T19:38:29.004Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["Windows", "Linux"], "product": "ArcGIS Server", "vendor": "Esri", "versions": [{"lessThan": "12.0", "status": "affected", "version": "11.1", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "There is s denial of service vulnerability in Esri ArcGIS Server versions 12.0 and prior that may allow a remote, unauthenticated attacker to supply crafted requests that may, under exceptional circumstances, consume all available worker threads and deny service to users. A patch is provided for ArcGIS Server software in General Availability and Extended support status, which includes versions 12.0, 11.5, 11.3, and 11.1. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch."}], "value": "There is s denial of service vulnerability in Esri ArcGIS Server versions 12.0 and prior that may allow a remote, unauthenticated attacker to supply crafted requests that may, under exceptional circumstances, consume all available worker threads and deny service to users. A patch is provided for ArcGIS Server software in General Availability and Extended support status, which includes versions 12.0, 11.5, 11.3, and 11.1. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "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-400", "description": "CWE-400 Uncontrolled Resource Consumption", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "cedc17bb-4939-4f40-a1f4-30ae8af1094e", "shortName": "Esri", "dateUpdated": "2026-10-26T18:07:22.699Z"}, "references": [{"url": "https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/october-2026-arcgis-security-bulletin"}], "source": {"discovery": "UNKNOWN"}, "title": "BUG-000186514 - ArcGIS Server has a security vulnerability.", "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-33521", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-26T18:58:18.796884Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-26T19:38:29.004Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Windows", "Linux"], "product": "ArcGIS Server", "vendor": "Esri", "versions": [{"lessThan": "12.0", "status": "affected", "version": "11.1", "versionType": "custom"}]}], "source": "psirt@esri.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "There is s denial of service vulnerability in Esri ArcGIS Server versions 12.0 and prior that may allow a remote, unauthenticated attacker to supply crafted requests that may, under exceptional circumstances, consume all available worker threads and deny service to users. A patch is provided for ArcGIS Server software in General Availability and Extended support status, which includes versions 12.0, 11.5, 11.3, and 11.1. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch."}], "id": "CVE-2026-33521", "lastModified": "2026-10-26T20:17:55.980", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "psirt@esri.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33521", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-26T18:58:18.796884Z", "version": "2.0.3"}}]}, "published": "2026-10-26T18:17:46.360", "references": [{"source": "psirt@esri.com", "url": "https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/october-2026-arcgis-security-bulletin"}], "sourceIdentifier": "psirt@esri.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "psirt@esri.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["windows", "linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[11.1,12.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ArcGIS Server", "source": "cna", "vendor": "Esri"}, "product": "arcgis_server", "vendor": "esri"}], "created": "2026-10-26T19:24:26.149340+00:00", "title": "Denial of Service via crafted requests in Esri ArcGIS Server 12.0 and earlier", "updated": "2026-10-26T20:15:14.792736+00:00", "vendors": ["esri", "esri$PRODUCT$arcgis_server"]}