{"id":"CVE-2026-71937","aliases":["EUVD-2026-64996","GHSA-75q7-4wfq-wpxr"],"status":"published","title":"DrayTek VigorSwitch Multiple Models Buffer Overflow via poe_schedule_profile","description":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.","severity":{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00683,"percentile":0.5283,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2026-08-24T17:08:01Z","modified":"2026-10-12T22:10:00Z","products":[{"vendor":"draytek corporation","product":"vigorswitch fx2120"},{"vendor":"draytek corporation","product":"vigorswitch g1280"},{"vendor":"draytek corporation","product":"vigorswitch g1282"},{"vendor":"draytek corporation","product":"vigorswitch g2100"},{"vendor":"draytek corporation","product":"vigorswitch g2121"},{"vendor":"draytek corporation","product":"vigorswitch g2280x"},{"vendor":"draytek corporation","product":"vigorswitch g2282x"},{"vendor":"draytek corporation","product":"vigorswitch g2540x"},{"vendor":"draytek corporation","product":"vigorswitch g2540xs"},{"vendor":"draytek corporation","product":"vigorswitch g2542x"},{"vendor":"draytek corporation","product":"vigorswitch p1280"},{"vendor":"draytek corporation","product":"vigorswitch p1281x"},{"vendor":"draytek corporation","product":"vigorswitch p1282"},{"vendor":"draytek corporation","product":"vigorswitch p2100"},{"vendor":"draytek corporation","product":"vigorswitch p2121"},{"vendor":"draytek corporation","product":"vigorswitch p2280x"},{"vendor":"draytek corporation","product":"vigorswitch p2282x"},{"vendor":"draytek corporation","product":"vigorswitch p2540x"},{"vendor":"draytek corporation","product":"vigorswitch p2540xs"},{"vendor":"draytek corporation","product":"vigorswitch p2542x"},{"vendor":"draytek corporation","product":"vigorswitch p2542xh"},{"vendor":"draytek corporation","product":"vigorswitch pq2121x"},{"vendor":"draytek corporation","product":"vigorswitch pq2200xb"},{"vendor":"draytek corporation","product":"vigorswitch pq2300xb"},{"vendor":"draytek corporation","product":"vigorswitch px2060"},{"vendor":"draytek corporation","product":"vigorswitch q2121x"},{"vendor":"draytek corporation","product":"vigorswitch q2200x"},{"vendor":"draytek corporation","product":"vigorswitch q2300x"}],"references":[{"url":"https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/","tags":["vendor-advisory"]},{"url":"https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-poe-schedule-profile","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71937"},{"url":"https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026"},{"url":"https://github.com/advisories/GHSA-75q7-4wfq-wpxr"}],"sources":{"cve":[{"id":"CVE-2026-71937","title":"DrayTek VigorSwitch Multiple Models Buffer Overflow via poe_schedule_profile","description":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.","status":"published","published":"2026-08-24T17:08:01.844Z","modified":"2026-08-24T18:45:00.987Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:19:49.559463Z"}],"euvd":[{"id":"EUVD-2026-64996","description":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.","status":"published","published":"2026-08-24T17:08:01Z","modified":"2026-08-24T18:45:00Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:01:34.230875Z"}],"ghsa":[{"id":"GHSA-75q7-4wfq-wpxr","title":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the...","description":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.","status":"published","published":"2026-08-24T18:31:56Z","modified":"2026-08-24T18:32:04Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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","level":"high"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:10:54.733778Z"}],"nvd":[{"id":"CVE-2026-71937","description":"Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the poe_schedule_profile function. The vulnerability is caused by repeated concatenation of the start_date, start_time, duration_time, how_often, weekdays, monthly_date, and cycle_duration fields into small fixed-size buffers without proper length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.","status":"published","published":"2026-08-24T18:17:18.89Z","modified":"2026-10-12T22:10:00.247Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:12:41.018848Z"}]}}