{"id":"CVE-2026-75488","kind":"vulnerability","aliases":["CVE-2026-75488"],"related":[],"title":"Cudy TR3000 router: CWMP client stack overflow lets a malicious ACS crash the process","description":"Cudy TR3000 before 2.5.42 contains a stack buffer overflow vulnerability in the CWMP client that allows a malicious ACS to corrupt stack memory via oversized credentials. Attackers controlling the ACS can send Username and Password values up to 256 bytes in TR-069 Download or Upload requests, overflowing 128-byte stack buffers and crashing the CWMP process.","summary":"The Cudy TR3000 router's CWMP (TR-069) client copies oversized Username and Password values into a 128-byte stack buffer without bounds checking. A malicious or compromised ACS (auto-configuration server) can send 256-byte credentials in Download or Upload requests, corrupting stack memory and crashing the CWMP process.","severity":"high","cvss":8.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cudy","cwmp","home-router","infrastructure","router","tr-069","tr3000"],"not_affected_if":["cwmp-disabled","firmware-2.5.42-or-later","managed-hosting"],"how_to_check":"- Check the router's firmware version in the Cudy web admin (System or Status page) and compare it with `2.5.42`.\n- Check whether TR-069 / CWMP remote management is enabled on the device.","fix":"- Cudy TR3000: move to firmware `2.5.42` or later.","status":"open","published_at":"2026-11-13T10:18:16+00:00","first_seen_at":"2026-11-13T10:47:35+00:00","triaged_at":"2026-11-13T10:51:21+00:00","updated_at":"2026-11-13T10:51:21+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-11-13T10:51:21Z","model":"claude-haiku-5-5","output":{"fix":"- Cudy TR3000: move to firmware `2.5.42` or later.","reach":"network","title":"Cudy TR3000 router: CWMP client stack overflow lets a malicious ACS crash the process","impact":"medium","summary":"The Cudy TR3000 router's CWMP (TR-069) client copies oversized Username and Password values into a 128-byte stack buffer without bounds checking. A malicious or compromised ACS (auto-configuration server) can send 256-byte credentials in Download or Upload requests, corrupting stack memory and crashing the CWMP process.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["cudy","tr3000","router","tr-069","cwmp","home-router"],"confidence":0.7,"fix_status":"available","needs_auth":"unknown","worst_case":"CWMP process crashes; stack corruption from a malicious ACS","analyst_note":"Confirm whether the CWMP client is enabled by default on TR3000 and whether the vulnerable path allows code execution beyond a crash; check the vulncheck advisory.","how_to_check":"- Check the router's firmware version in the Cudy web admin (System or Status page) and compare it with `2.5.42`.\n- Check whether TR-069 / CWMP remote management is enabled on the device.","plain_action":"Update your Cudy TR3000 router to firmware 2.5.42 or later.","product_name":"","needs_analyst":true,"not_affected_if":["firmware-2.5.42-or-later","cwmp-disabled","managed-hosting"],"who_is_affected":"Cudy TR3000 routers running firmware before 2.5.42 that use the CWMP/TR-069 client, which is what lets the device be managed by an ACS. Exposure depends on the ACS being attacker-controlled, so the risk is highest where the ACS path or its credentials can be influenced. Devices without TR-069 management enabled, or on firmware 2.5.42 or later, are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000827,"input_tokens":4618,"output_tokens":731,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-069':29B,38B,124C '-2026':16A,19A '-75488':17A,20A '128':48B,130C '2.5.42':85C '256':66B,120C 'ac':11A,59B,100C,111C 'allow':97C 'attack':108C 'auto':61B 'auto-configur':60B 'bound':53B 'buffer':51B,89C,133C 'byte':49B,67B,121C,131C 'check':54B 'client':5A,39B,95C 'compromis':58B 'configur':62B 'contain':86C 'control':109C 'copi':40B 'corrupt':74B,102C 'crash':12A,78B,135C 'credenti':68B,107C 'cudi':1A,21B,32B,82C 'cve':15A,18A 'cwmp':4A,22B,36B,80B,94C,137C 'download':70B,125C 'home':24B 'home-rout':23B 'infrastructur':26B 'let':8A 'malici':10A,56B,99C 'memori':76B,104C 'overflow':7A,90C,129C 'overs':41B,106C 'password':44B,116C 'process':14A,81B,138C 'request':73B,128C 'router':3A,25B,27B,34B 'send':65B,113C 'server':63B 'stack':6A,50B,75B,88C,103C,132C 'tr':28B,37B,123C 'tr3000':2A,30B,33B,83C 'upload':72B,127C 'usernam':42B,114C 'valu':45B,117C 'via':105C 'vulner':91C 'without':52B","nicknames":[],"mitigations":[],"who_affected":"Cudy TR3000 routers running firmware before 2.5.42 that use the CWMP/TR-069 client, which is what lets the device be managed by an ACS. Exposure depends on the ACS being attacker-controlled, so the risk is highest where the ACS path or its credentials can be influenced. Devices without TR-069 management enabled, or on firmware 2.5.42 or later, are not affected.","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.","pkeys":[],"ptokens":[],"labels":["cudy","cwmp","high","homerouter","infrastructure","router","tr069","tr3000"],"campaign_type":null,"search_a":"'-2026':16A,19A '-75488':17A,20A 'ac':11A 'client':5A 'crash':12A 'cudi':1A 'cve':15A,18A 'cwmp':4A 'let':8A 'malici':10A 'overflow':7A 'process':14A 'router':3A 'stack':6A 'tr3000':2A","search_b":"'-069':29B,38B '128':48B '256':66B 'ac':59B 'auto':61B 'auto-configur':60B 'bound':53B 'buffer':51B 'byte':49B,67B 'check':54B 'client':39B 'compromis':58B 'configur':62B 'copi':40B 'corrupt':74B 'crash':78B 'credenti':68B 'cudi':21B,32B 'cwmp':22B,36B,80B 'download':70B 'home':24B 'home-rout':23B 'infrastructur':26B 'malici':56B 'memori':76B 'overs':41B 'password':44B 'process':81B 'request':73B 'router':25B,27B,34B 'send':65B 'server':63B 'stack':50B,75B 'tr':28B,37B 'tr3000':30B,33B 'upload':72B 'usernam':42B 'valu':45B 'without':52B","search_c":"'-069':124C '128':130C '2.5.42':85C '256':120C 'ac':100C,111C 'allow':97C 'attack':108C 'buffer':89C,133C 'byte':121C,131C 'client':95C 'contain':86C 'control':109C 'corrupt':102C 'crash':135C 'credenti':107C 'cudi':82C 'cwmp':94C,137C 'download':125C 'malici':99C 'memori':104C 'overflow':90C,129C 'overs':106C 'password':116C 'process':138C 'request':128C 'send':113C 'stack':88C,103C,132C 'tr':123C 'tr3000':83C 'upload':127C 'usernam':114C 'valu':117C 'via':105C 'vulner':91C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:18:16+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/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-2026-75488","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75488","severity":null,"published_at":"2026-11-13T10:18:16+00:00","modified_at":"2026-11-13T10:18:16+00:00","first_seen_at":"2026-11-13T10:47:35+00:00","fetched_at":"2026-11-13T10:47:35+00:00","note":null}],"documents":[{"id":145500,"url":"https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-stack-buffer-overflow-via-cwmp-basic-authorization-builder","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"}