CVE-2021-28840

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When the binary handle the specific HTTP GET request, the content in upload_file variable is NULL in the upload_config function then the strncasecmp would take NULL as first argument, and incur the NULL pointer dereference vulnerability."}, {"lang": "es", "value": "Se presenta una vulnerabilidad de Desreferencia de Puntero Null en D-Link DAP-2310 versi\u00f3n 2.07.RC031, DAP-2330 versi\u00f3n 1.07.RC028, DAP-2360 versi\u00f3n 2.07.RC043, DAP-2553 versi\u00f3n 3.06.RC027, DAP-2660 versi\u00f3n 1. 13.RC074, DAP-2690 versi\u00f3n 3.16.RC100, DAP-2695 versi\u00f3n 1.17.RC063, DAP-3320 versi\u00f3n 1.01.RC014 y DAP-3662 versi\u00f3n 1.01.RC022, en la funci\u00f3n upload_config del binario sbin/httpd. Cuando el binario maneja la petici\u00f3n HTTP GET espec\u00edfica, el contenido en la variable upload_file es NULL en la funci\u00f3n upload_config entonces el strncasecmp tomar\u00eda NULL como primer argumento, e incurrir\u00eda en la vulnerabilidad de Desreferencia de Puntero Null"}], "id": "CVE-2021-28840", "lastModified": "2026-06-17T03:46:58.327", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-10T18:15:07.220", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://www.dlink.com/en/security-bulletin/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.dlink.com/en/security-bulletin/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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