{"id":"CVE-2026-81433","aliases":["EUVD-2026-89488","GHSA-h8f9-rp2r-962g"],"status":"published","title":"Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution","description":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00204,"percentile":0.10495,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120","CWE-121","CWE-787"],"published":"2026-09-29T23:05:47Z","modified":"2026-10-01T04:18:20Z","products":[{"vendor":"watchguard","product":"fireware os"}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-81433","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81433"},{"url":"https://github.com/advisories/GHSA-h8f9-rp2r-962g"}],"sources":{"cve":[{"id":"CVE-2026-81433","title":"Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution","description":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.","status":"published","published":"2026-09-29T23:05:47.399Z","modified":"2026-10-01T03:55:40.175Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-120","CWE-121","CWE-787"],"updated_at":"2026-11-02T13:36:29.327819Z"}],"euvd":[{"id":"EUVD-2026-89488","description":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.","status":"published","published":"2026-09-29T23:05:47Z","modified":"2026-10-01T03:55:40Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:46.94346Z"}],"ghsa":[{"id":"GHSA-h8f9-rp2r-962g","title":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting...","description":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.","status":"published","published":"2026-09-30T00:32:48Z","modified":"2026-09-30T00:32:56Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/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","level":"high"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:12:35.132592Z"}],"nvd":[{"id":"CVE-2026-81433","description":"A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.","status":"published","published":"2026-09-30T00:16:36.15Z","modified":"2026-10-01T04:18:20.963Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/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","level":"high","assessor":"secondary"}],"cwes":["CWE-120","CWE-121","CWE-787"],"updated_at":"2026-11-02T14:12:52.759595Z"}]}}