{"id":"CVE-2026-74233","state":"PUBLISHED","title":"Zbtlink MQWrt infosrvd Command Injection","description":"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.","publishedAt":"2026-08-27T10:40:11.313Z","updatedAt":"2026-08-27T13:41:32.924Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["Zbtlink WE1326","Zbtlink WE2426-C","Zbtlink WE357","Zbtlink WE5926","Zbtlink WE5926-EC_QP","Zbtlink WE5926-WD","Zbtlink WE826-Q","Zbtlink WE826-T2","Zbtlink WE826-WD","Zbtlink WF3526-P","Zbtlink WG108","Zbtlink WG3526","Unknown CTN720-W1","Unknown LF-1541","Unknown MT7620N","Unknown WRC1"],"affected":[{"vendor":"Zbtlink","product":"WE1326","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE2426-C","defaultStatus":"unknown","versions":[{"version":"19.1112","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE357","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE5926","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE5926-EC_QP","defaultStatus":"unknown","versions":[{"version":"20.0516","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE5926-WD","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE826-Q","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE826-T2","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WE826-WD","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WF3526-P","defaultStatus":"unknown","versions":[{"version":"19.051","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WG108","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Zbtlink","product":"WG3526","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Unknown","product":"CTN720-W1","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Unknown","product":"LF-1541","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Unknown","product":"MT7620N","defaultStatus":"unknown","versions":[{"version":"19.1101","status":"affected","versionType":"custom"}]},{"vendor":"Unknown","product":"WRC1","defaultStatus":"unknown","versions":[{"version":"20.0622","status":"affected","versionType":"custom"}]}],"references":["http://vulncheck.com/blog/zbt-darklantern-speakingstone","https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection"],"weaknesses":["CWE-321","CWE-78"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74233.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74233","state":"PUBLISHED","datePublished":"2026-08-27T10:40:11.313Z","dateUpdated":"2026-08-27T13:41:32.924Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-14T18:01:19.917Z"},"containers":{"cna":{"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 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