{"id":"CVE-2026-93866","state":"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.","publishedAt":"2026-10-27T15:52:27.871Z","updatedAt":"2026-10-27T15:52:27.871Z","severity":{"score":9.2,"label":"Critical","version":"4.0","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","source":"WatchGuard"},"assigner":"WatchGuard","products":["WatchGuard Fireware OS"],"affected":[{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"2025.1","status":"affected","lessThan":"2026.4","versionType":"custom"},{"version":"12.0","status":"affected","lessThan":"12.12.4","versionType":"custom"}],"platforms":["Default"]},{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"12.0","status":"affected","lessThan":"12.5.22","versionType":"custom"}],"platforms":["T15/T35"]}],"references":["https://psirt.watchguard.com/CVE-2026-93866"],"weaknesses":["CWE-190","CWE-288","CWE-787"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93866.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93866","state":"PUBLISHED","datePublished":"2026-10-27T15:52:27.871Z","dateUpdated":"2026-10-27T15:52:27.871Z","assignerShortName":"WatchGuard","assignerOrgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","dateReserved":"2026-09-18T19:29:25.403Z"},"containers":{"cna":{"title":"Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"2025.1","status":"affected","lessThan":"2026.4","versionType":"custom"},{"version":"12.0","status":"affected","lessThan":"12.12.4","versionType":"custom"}],"platforms":["Default"]},{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"12.0","status":"affected","lessThan":"12.5.22","versionType":"custom"}],"platforms":["T15/T35"]}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-93866","tags":["vendor-advisory"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"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","baseScore":9.2,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190","type":"CWE"},{"cweId":"CWE-288","lang":"en","description":"CWE-288","type":"CWE"},{"cweId":"CWE-787","lang":"en","description":"CWE-787","type":"CWE"}]}],"providerMetadata":{"shortName":"WatchGuard","orgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","dateUpdated":"2026-10-27T15:52:27.871Z"},"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"12.0","versionEndExcluding":"12.5.22"},{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"2025.1","versionEndExcluding":"2026.4"},{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"12.0","versionEndExcluding":"12.12.4"}]}]}],"credits":[{"lang":"en","value":"Laurent GAFFIE , secorizon.com","type":"finder"}],"configurations":[{"lang":"en","value":"This vulnerability affects Firebox deployments with the Access Portal enabled.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>This vulnerability affects Firebox deployments with the Access Portal enabled.</p>"}]}],"solutions":[{"lang":"en","value":"Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22","supportingMedia":[{"type":"text/html","base64":false,"value":"Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22"}]}],"exploits":[{"lang":"en","value":"WatchGuard is not aware of any exploitation of this vulnerability in the wild.","supportingMedia":[{"type":"text/html","base64":false,"value":"WatchGuard is not aware of any exploitation of this vulnerability in the wild."}]}]}}}}