{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121617", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-11-03T16:39:58.548Z", "datePublished": "2026-11-04T02:45:20.465Z", "dateUpdated": "2026-11-04T02:45:20.465Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-11-04T02:45:20.465Z"}, "title": "Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-787", "lang": "en", "description": "Out-of-bounds Write"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "Memory Corruption"}]}], "affected": [{"vendor": "Linksys", "product": "E5600", "versions": [{"version": "1.1.0.26", "status": "affected"}], "cpes": ["cpe:2.3:o:linksys:e5600_firmware:*:*:*:*:*:*:*:*"], "modules": ["Header Parser"]}], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in Linksys E5600 1.1.0.26. Affected by this issue is the function init_multipart of the file /cgi-bin/upload_fw.cgi of the component Header Parser. The manipulation results in out-of-bounds write. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P", "baseSeverity": "HIGH"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:C", "baseSeverity": "HIGH"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 7.5, "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:C", "baseSeverity": "HIGH"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 7.8, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C/E:POC/RL:ND/RC:C"}}], "timeline": [{"time": "2026-11-03T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-11-03T01:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-11-03T17:45:17.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "liuyingqi (VulDB User)", "type": "reporter"}, {"lang": "en", "value": "VulDB CNA Team", "type": "coordinator"}], "references": [{"url": "https://vuldb.com/vuln/430465", "name": "VDB-430465 | Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/430465/cti", "name": "VDB-430465 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/cve/CVE-2026-121617", "name": "CVE-2026-121617 | CVE Analysis and Report", "tags": ["third-party-advisory"]}, {"url": "https://vuldb.com/submit/1023313", "name": "Submit #1023313 | Linksys E5600 1.1.0.26 Buffer Overflow - Out-of-bounds Write (CWE-787)", "tags": ["third-party-advisory"]}, {"url": "https://github.com/Zimo-666/E5600-cves/tree/main/04-upload-fw-multipart-overflow", "tags": ["exploit"]}, {"url": "https://www.linksys.com/", "tags": ["product"]}], "tags": ["unsupported-when-assigned"], "x_generator": ["VulDB PVTS v202611"]}}}

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{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:o:linksys:e5600_firmware:*:*:*:*:*:*:*:*"], "modules": ["Header Parser"], "product": "E5600", "vendor": "Linksys", "versions": [{"status": "affected", "version": "1.1.0.26"}]}], "source": "cna@vuldb.com"}], "cveTags": [{"sourceIdentifier": "cna@vuldb.com", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in Linksys E5600 1.1.0.26. Affected by this issue is the function init_multipart of the file /cgi-bin/upload_fw.cgi of the component Header Parser. The manipulation results in out-of-bounds write. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer."}], "id": "CVE-2026-121617", "lastModified": "2026-11-04T03:17:15.453", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.8, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "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": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}]}, "published": "2026-11-04T03:17:15.287", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/Zimo-666/E5600-cves/tree/main/04-upload-fw-multipart-overflow"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/cve/CVE-2026-121617"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/1023313"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/430465"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/430465/cti"}, {"source": "cna@vuldb.com", "url": "https://www.linksys.com/"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-787"}], "source": "cna@vuldb.com", "type": "Primary"}]}

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