CVE-2021-43803

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In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue."}]}, "impact": {"cvss": {"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"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-20: Improper Input Validation"}]}]}, "references": {"reference_data": [{"name": "https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx", "refsource": "CONFIRM", "url": "https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx"}, {"name": "https://github.com/vercel/next.js/pull/32080", "refsource": "MISC", "url": "https://github.com/vercel/next.js/pull/32080"}, {"name": "https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264", "refsource": "MISC", "url": "https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264"}, {"name": "https://github.com/vercel/next.js/releases/tag/v11.1.3", "refsource": "MISC", "url": "https://github.com/vercel/next.js/releases/tag/v11.1.3"}, {"name": "https://github.com/vercel/next.js/releases/v12.0.5", "refsource": "MISC", "url": "https://github.com/vercel/next.js/releases/v12.0.5"}]}, "source": {"advisory": "GHSA-25mp-g6fv-mqxx", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T04:03:08.709Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/vercel/next.js/pull/32080"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/vercel/next.js/releases/tag/v11.1.3"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/vercel/next.js/releases/v12.0.5"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-43803", "datePublished": "2021-12-09T23:50:10.000Z", "dateReserved": "2021-11-16T00:00:00.000Z", "dateUpdated": "2024-08-04T04:03:08.709Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "next.js", "vendor": "vercel", "versions": [{"status": "affected", "version": ">= 11.1.0, < 11.1.3"}, {"status": "affected", "version": ">= 12.0.0, < 12.0.5"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "D413EFEB-941C-4FDD-BA04-32B7902BCFE7", "versionEndExcluding": "11.1.3", "versionStartIncluding": "11.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "C1457A80-9287-4C15-9AF3-8CE57500C4AA", "versionEndExcluding": "12.0.5", "versionStartIncluding": "12.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:a:nodejs:node.js:*:*:*:*:*:*:*:*", "matchCriteriaId": "2B44D2C4-15DF-4918-B374-3C780CC43ACC", "versionStartExcluding": "15.0.0", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Next.js is a React framework. In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue."}, {"lang": "es", "value": "Next.js es un framework de React. En las versiones de Next.js anteriores a 12.0.5 o 11.1.3, las direcciones URL no v\u00e1lidas o malformadas podr\u00edan conllevar a un bloqueo del servidor. Para verse afectado por este problema, el despliegue debe usar versiones de Next.js superiores a 11.1.0 y anteriores a 12.0.5, Node.js versiones posteriores a 15.0.0, y el siguiente inicio o un servidor personalizado. Los despliegues en Vercel no est\u00e1n afectados, junto con entornos similares en los que las peticiones no v\u00e1lidas son filtradas antes de llegar a Next.js. Las versiones 12.0.5 y 11.1.3 contienen parches para este problema"}], "id": "CVE-2021-43803", "lastModified": "2026-06-17T04:11:28.210", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "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": "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": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2021-12-10T00:15:11.827", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/pull/32080"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/releases/tag/v11.1.3"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/releases/v12.0.5"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/pull/32080"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/releases/tag/v11.1.3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/releases/v12.0.5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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