{"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":"2026-08-27T13:41:32.924Z"},"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"}]}]},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T13:41:26.633961Z","id":"CVE-2026-74233","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-27T13:41:32.924Z"}}]}}