{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74233", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-14T18:01:19.917Z", "datePublished": "2026-08-27T10:40:11.313Z", "dateUpdated": "2026-08-27T10:40:11.313Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-08-27T10:40:11.313Z"}, "title": "Zbtlink MQWrt infosrvd Command Injection", "descriptions": [{"lang": "en", "value": "Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective."}], "datePublic": "2026-08-27T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-321", "description": "Use of Hard-coded Cryptographic Key", "type": "CWE"}, {"lang": "en", "cweId": "CWE-78", "description": "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE"}]}], "affected": [{"vendor": "Zbtlink", "product": "WE1326", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE2426-C", "versions": [{"status": "affected", "version": "19.1112", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE357", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE5926", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE5926-EC_QP", "versions": [{"status": "affected", "version": "20.0516", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE5926-WD", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE826-Q", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE826-T2", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WE826-WD", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WF3526-P", "versions": [{"status": "affected", "version": "19.051", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WG108", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Zbtlink", "product": "WG3526", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Unknown", "product": "CTN720-W1", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Unknown", "product": "LF-1541", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Unknown", "product": "MT7620N", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Unknown", "product": "WRC1", "versions": [{"status": "affected", "version": "20.0622", "versionType": "custom"}], "defaultStatus": "unknown"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "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": "CRITICAL", "baseScore": 9.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}}], "references": [{"url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone", "name": "VulnCheck Blog", "tags": ["technical-description", "exploit"]}, {"url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "Jacob Baines of VulnCheck", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.4"}, "impacts": [{"capecId": "CAPEC-88", "descriptions": [{"lang": "en", "value": "CAPEC-88 OS Command Injection"}]}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "WE1326", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE2426-C", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1112", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE357", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE5926", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE5926-EC_QP", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "20.0516", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE5926-WD", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE826-Q", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE826-T2", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WE826-WD", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WF3526-P", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.051", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WG108", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WG3526", "vendor": "Zbtlink", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "CTN720-W1", "vendor": "Unknown", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "LF-1541", "vendor": "Unknown", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "MT7620N", "vendor": "Unknown", "versions": [{"status": "affected", "version": "19.1101", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "WRC1", "vendor": "Unknown", "versions": [{"status": "affected", "version": "20.0622", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective."}], "id": "CVE-2026-74233", "lastModified": "2026-08-27T13:18:34.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-08-27T13:18:34.137", "references": [{"source": "disclosure@vulncheck.com", "url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-321"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{}

{}