CVE-2021-21265

{"containers": {"cna": {"title": "October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers", "problemTypes": [{"descriptions": [{"cweId": "CWE-644", "lang": "en", "description": "CWE-644: Improper Neutralization of HTTP Headers for Scripting Syntax", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp"}, {"name": "https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d", "tags": ["x_refsource_MISC"], "url": "https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d"}, {"name": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6", "tags": ["x_refsource_MISC"], "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6"}, {"name": "https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30", "tags": ["x_refsource_MISC"], "url": "https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30"}, {"name": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0", "tags": ["x_refsource_MISC"], "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0"}, {"name": "https://packagist.org/packages/october/backend", "tags": ["x_refsource_MISC"], "url": "https://packagist.org/packages/october/backend"}], "affected": [{"vendor": "octobercms", "product": "october", "versions": [{"version": "< 1.1.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-05-29T23:27:29.528Z"}, "descriptions": [{"lang": "en", "value": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force."}], "source": {"advisory": "GHSA-xhfx-hgmf-v6vp", "discovery": "UNKNOWN"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:15.269Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21265", "datePublished": "2021-03-10T21:15:15.000Z", "dateReserved": "2020-12-22T00:00:00.000Z", "dateUpdated": "2025-05-29T23:27:29.528Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "october", "vendor": "octobercms", "versions": [{"status": "affected", "version": "< 1.1.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*", "matchCriteriaId": "E34205D2-FCF8-4F33-8835-3CEA0E253936", "versionEndExcluding": "1.1.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force."}, {"lang": "es", "value": "October es una plataforma CMS gratuita, de c\u00f3digo abierto y autoinvitada basada en Laravel PHP Framework.&#xa0;En October versiones anteriores a 1.1.2, cuando se ejecuta en servidores mal configurados (es decir, el servidor enruta cualquier petici\u00f3n, independientemente del encabezado HOST hacia una instancia CMS de october), se presenta la posibilidad de que los ataques de Envenenamiento del Encabezado de host tengan \u00e9xito.&#xa0;Esto ha sido solucionado en la versi\u00f3n 1.1.2, al agregar una funci\u00f3n para permitir que se especifique un conjunto de hosts confiables en la aplicaci\u00f3n.&#xa0;Como soluci\u00f3n alternativa, puede establecerse el ajuste de configuraci\u00f3n cms.linkPolicy para forzar"}], "id": "CVE-2021-21265", "lastModified": "2026-06-17T03:35:09.290", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-10T22:15:12.057", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6"}, {"source": "security-advisories@github.com", "url": "https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp"}, {"source": "security-advisories@github.com", "url": "https://packagist.org/packages/october/backend"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-644"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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