{"id":"CVE-2026-6240","aliases":["EUVD-2026-34935","GHSA-qv33-m6vq-mqmr"],"status":"published","title":"Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS","description":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a  crafted malicious request containing an excessive number of identifiers to overflow stack memory.\n\nSuccessful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.","severity":{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0018,"percentile":0.07649,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-06-05T23:51:39Z","modified":"2026-07-23T07:10:00Z","products":[{"vendor":"tp-link systems inc.","product":"tapo c520ws v2"}],"references":[{"url":"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes","tags":["patch"]},{"url":"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes","tags":["patch"]},{"url":"https://www.tp-link.com/us/support/faq/5120/","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6240"},{"url":"https://www.tp-link.com/us/support/faq/5120"},{"url":"https://github.com/advisories/GHSA-qv33-m6vq-mqmr"}],"sources":{"cve":[{"id":"CVE-2026-6240","title":"Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS","description":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a  crafted malicious request containing an excessive number of identifiers to overflow stack memory.\n\nSuccessful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.","status":"published","published":"2026-06-05T23:51:39.483Z","modified":"2026-06-08T13:08:05.175Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-34935","description":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a  crafted malicious request containing an excessive number of identifiers to overflow stack memory.\n\nSuccessful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.","status":"published","published":"2026-06-05T23:51:39Z","modified":"2026-06-08T13:08:05Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:20:49.297547Z"}],"ghsa":[{"id":"GHSA-qv33-m6vq-mqmr","title":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers...","description":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a  crafted malicious request containing an excessive number of identifiers to overflow stack memory.\n\nSuccessful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.","status":"published","published":"2026-06-06T00:31:38Z","modified":"2026-06-06T00:33:35Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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","level":"medium"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:08:36.825797Z"}],"nvd":[{"id":"CVE-2026-6240","description":"A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a  crafted malicious request containing an excessive number of identifiers to overflow stack memory.\n\nSuccessful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.","status":"published","published":"2026-06-06T00:16:41.103Z","modified":"2026-07-23T07:10:00.113Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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","level":"medium","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:22.73178Z"}]}}