{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-17251", "assignerOrgId": "f23511db-6c3e-4e32-a477-6aa17d310630", "state": "PUBLISHED", "assignerShortName": "TPLink", "dateReserved": "2026-07-24T22:03:11.872Z", "datePublished": "2026-08-21T17:16:45.791Z", "dateUpdated": "2026-08-21T17:40:36.098Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f23511db-6c3e-4e32-a477-6aa17d310630", "shortName": "TPLink", "dateUpdated": "2026-08-21T17:16:45.791Z"}, "title": "Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-476", "description": "CWE-476 NULL pointer dereference", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-135", "descriptions": [{"lang": "en", "value": "CAPEC-135 Format String Injection"}]}], "affected": [{"vendor": "TP-Link Systems Inc.", "product": "TL-MR6400 v7.0", "platforms": ["Linux"], "versions": [{"status": "affected", "version": "0", "lessThan": "1.9.0 Build 260714", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "A NULL\npointer dereference vulnerability exists in the HTTP request parsing\nfunctionality of\u00a0\nTL-MR6400 v7. An unauthenticated remote attacker can\ntrigger the vulnerability by sending a specially crafted HTTP request\ncontaining a malformed session cookie header. \n\n\n\n\n\nSuccessful\nexploitation may cause the HTTP service process to crash, resulting in a\ndenial-of-service condition and temporary loss of management or CGI\nfunctionality until service recovery.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>A NULL\npointer dereference vulnerability exists in the HTTP request parsing\nfunctionality of&nbsp;\nTL-MR6400 v7. An unauthenticated remote attacker can\ntrigger the vulnerability by sending a specially crafted HTTP request\ncontaining a malformed session cookie header. </p>\n\n<p>Successful\nexploitation may cause the HTTP service process to crash, resulting in a\ndenial-of-service condition and temporary loss of management or CGI\nfunctionality until service recovery.</p>"}]}], "references": [{"url": "https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware", "tags": ["patch"]}, {"url": "https://www.tp-link.com/tw/support/download/tl-mr6400/v7/#Firmware", "tags": ["patch"]}, {"url": "https://www.tp-link.com/us/support/faq/5259/", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.1, "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Rui Cheng Yu (Hina)", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.4"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-21T17:40:25.485077Z", "id": "CVE-2026-17251", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T17:40:36.098Z"}}]}}

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