{"id":"CVE-2026-93866","aliases":["EUVD-2026-111157","GHSA-g944-9gh9-2wqp"],"status":"published","title":"Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write","description":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00509,"percentile":0.43928,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190","CWE-288","CWE-787"],"published":"2026-10-27T15:52:27Z","modified":"2026-11-04T20:26:51Z","products":[{"vendor":"watchguard","product":"fireware os"}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-93866","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93866"},{"url":"https://github.com/advisories/GHSA-g944-9gh9-2wqp"}],"sources":{"cve":[{"id":"CVE-2026-93866","title":"Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write","description":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","status":"published","published":"2026-10-27T15:52:27.871Z","modified":"2026-11-04T20:26:51.215Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-190","CWE-288","CWE-787"],"updated_at":"2026-11-04T21:42:22.640148Z"}],"euvd":[{"id":"EUVD-2026-111157","description":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","status":"published","published":"2026-10-27T15:52:27Z","modified":"2026-11-04T20:26:51Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-04T21:45:43.843698Z"}],"ghsa":[{"id":"GHSA-g944-9gh9-2wqp","title":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard...","description":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","status":"published","published":"2026-10-27T18:31:36Z","modified":"2026-10-27T18:31:40Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/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","level":"critical"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:14:30.115077Z"}],"nvd":[{"id":"CVE-2026-93866","description":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","status":"published","published":"2026-10-27T16:17:33.013Z","modified":"2026-11-04T21:18:16.787Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/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","level":"critical","assessor":"secondary"}],"cwes":["CWE-190","CWE-288","CWE-787"],"updated_at":"2026-11-04T23:43:42.179273Z"}]}}