{"id":"CVE-2026-126953","kind":"vulnerability","aliases":["CVE-2026-126953"],"related":[],"title":"Cudy TR3000 router: remote commands run as root via TR-069 username","description":"Cudy TR3000 before 2.5.42 contains an OS command injection vulnerability that allows a malicious or compromised ACS to execute commands as root by supplying an unvalidated InternetGatewayDevice.User.{i}.Username value. Attackers can send a SetParameterValues request with shell metacharacters that set_UserUsername() in obuspa_system.lua passes to os.execute(), gaining root command execution.","summary":"Cudy TR3000 routers before 2.5.42 pass a username value from a remote management server to a shell without checking it. A malicious or compromised management server can run commands as root on the router.","severity":"critical","cvss":9.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cudy-tr3000","home-router","infrastructure","tr-069"],"not_affected_if":["firmware-2.5.42-or-later","no-acs-configured"],"how_to_check":"- Check the firmware version on the router's admin page and compare it with `2.5.42`.\n- Look for TR-069 or remote management (ACS) being enabled in the router settings.","fix":"- Cudy TR3000: move to `2.5.42` or later.","status":"open","published_at":"2026-11-13T10:18:02+00:00","first_seen_at":"2026-11-13T10:47:28+00:00","triaged_at":"2026-11-13T10:48:32+00:00","updated_at":"2026-11-13T10:48:32+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-11-13T10:48:32Z","model":"claude-haiku-5-5","output":{"fix":"- Cudy TR3000: move to `2.5.42` or later.","reach":"network","title":"Cudy TR3000 router: remote commands run as root via TR-069 username","impact":"high","summary":"Cudy TR3000 routers before 2.5.42 pass a username value from a remote management server to a shell without checking it. A malicious or compromised management server can run commands as root on the router.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["cudy-tr3000","tr-069","home-router"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker runs commands as root on the router.","analyst_note":"","how_to_check":"- Check the firmware version on the router's admin page and compare it with `2.5.42`.\n- Look for TR-069 or remote management (ACS) being enabled in the router settings.","plain_action":"Update your Cudy TR3000 router to firmware 2.5.42 or later through its admin page.","product_name":"","needs_analyst":false,"not_affected_if":["firmware-2.5.42-or-later","no-acs-configured"],"who_is_affected":"Routers running Cudy TR3000 firmware before 2.5.42 that are managed through a TR-069 ACS are exposed. The risk comes from the management server sending a crafted SetParameterValues request, so routers with no remote management configured are unlikely to be reachable this way.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"critical"},"cost_usd":0.000724,"input_tokens":4623,"output_tokens":524,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-069':11A,27B '-126953':15A,18A '-2026':14A,17A '2.5.42':32B,65C 'ac':78C 'allow':73C 'attack':92C 'check':46B 'command':5A,56B,69C,81C,111C 'compromis':51B,77C 'contain':66C 'cudi':1A,20B,28B,62C 'cudy-tr3000':19B 'cve':13A,16A 'execut':80C,112C 'gain':109C 'home':23B 'home-rout':22B 'infrastructur':25B 'inject':70C 'internetgatewaydevice.user':88C 'malici':49B,75C 'manag':40B,52B 'metacharact':100C 'obuspa_system.lua':105C 'os':68C 'os.execute':108C 'pass':33B,106C 'remot':4A,39B 'request':97C 'root':8A,58B,83C,110C 'router':3A,24B,30B,61B 'run':6A,55B 'send':94C 'server':41B,53B 'set':102C 'setparametervalu':96C 'shell':44B,99C 'suppli':85C 'tr':10A,26B 'tr3000':2A,21B,29B,63C 'unvalid':87C 'usernam':12A,35B,90C 'userusernam':103C 'valu':36B,91C 'via':9A 'vulner':71C 'without':45B","nicknames":[],"mitigations":[],"who_affected":"Routers running Cudy TR3000 firmware before 2.5.42 that are managed through a TR-069 ACS are exposed. The risk comes from the management server sending a crafted SetParameterValues request, so routers with no remote management configured are unlikely to be reachable this way.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update your Cudy TR3000 router to firmware 2.5.42 or later through its admin page.","pkeys":[],"ptokens":[],"labels":["critical","cudytr3000","homerouter","infrastructure","tr069"],"campaign_type":null,"search_a":"'-069':11A '-126953':15A,18A '-2026':14A,17A 'command':5A 'cudi':1A 'cve':13A,16A 'remot':4A 'root':8A 'router':3A 'run':6A 'tr':10A 'tr3000':2A 'usernam':12A 'via':9A","search_b":"'-069':27B '2.5.42':32B 'check':46B 'command':56B 'compromis':51B 'cudi':20B,28B 'cudy-tr3000':19B 'home':23B 'home-rout':22B 'infrastructur':25B 'malici':49B 'manag':40B,52B 'pass':33B 'remot':39B 'root':58B 'router':24B,30B,61B 'run':55B 'server':41B,53B 'shell':44B 'tr':26B 'tr3000':21B,29B 'usernam':35B 'valu':36B 'without':45B","search_c":"'2.5.42':65C 'ac':78C 'allow':73C 'attack':92C 'command':69C,81C,111C 'compromis':77C 'contain':66C 'cudi':62C 'execut':80C,112C 'gain':109C 'inject':70C 'internetgatewaydevice.user':88C 'malici':75C 'metacharact':100C 'obuspa_system.lua':105C 'os':68C 'os.execute':108C 'pass':106C 'request':97C 'root':83C,110C 'send':94C 'set':102C 'setparametervalu':96C 'shell':99C 'suppli':85C 'tr3000':63C 'unvalid':87C 'usernam':90C 'userusernam':103C 'valu':91C 'vulner':71C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:18:02+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126953","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126953","severity":null,"published_at":"2026-11-13T10:18:02+00:00","modified_at":"2026-11-13T10:18:02+00:00","first_seen_at":"2026-11-13T10:47:28+00:00","fetched_at":"2026-11-13T10:47:28+00:00","note":null}],"documents":[{"id":145267,"url":"https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-username","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}