{"api_version":"1","generated_at":"2026-10-01T17:06:24+00:00","cve":"CVE-2026-81433","urls":{"html":"https://cve.report/CVE-2026-81433","api":"https://cve.report/api/cve/CVE-2026-81433.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-81433","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81433"},"summary":{"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.","state":"PUBLISHED","assigner":"WatchGuard","published_at":"2026-09-30 00:16:36","updated_at":"2026-10-01 04:18:20"},"problem_types":["CWE-120","CWE-121","CWE-787","CWE-120 CWE-120","CWE-121 CWE-121","CWE-787 CWE-787"],"metrics":[{"version":"4.0","source":"5d1c2695-1a31-4499-88ae-e847036fd7e3","type":"Secondary","score":"8.7","severity":"HIGH","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","data":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}},{"version":"4.0","source":"CNA","type":"DECLARED","score":"8.7","severity":"HIGH","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","data":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-81433","name":"https://psirt.watchguard.com/CVE-2026-81433","refsource":"5d1c2695-1a31-4499-88ae-e847036fd7e3","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81433","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81433","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 2026.3 2026.3.2 custom","platforms":["Default"]},{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 2025.0 2026.2.3 custom","platforms":["Default"]},{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 12.0 12.12.3 custom","platforms":["Default"]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3","time":"","lang":"en"}],"workarounds":[],"exploits":[{"source":"CNA","title":"","value":"WatchGuard is not aware of any exploitation of this vulnerability in the wild.","time":"","lang":"en"}],"credits":[{"source":"CNA","value":"Laurent GAFFIE, (secorizon.com)","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-81433","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-09-30T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-10-01T03:55:40.175Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","platforms":["Default"],"product":"Fireware OS","vendor":"WatchGuard","versions":[{"lessThan":"2026.3.2","status":"affected","version":"2026.3","versionType":"custom"},{"lessThan":"2026.2.3","status":"affected","version":"2025.0","versionType":"custom"},{"lessThan":"12.12.3","status":"affected","version":"12.0","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"2026.3.2","versionStartIncluding":"2026.3","vulnerable":true},{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"2026.2.3","versionStartIncluding":"2025.0","vulnerable":true},{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"12.12.3","versionStartIncluding":"12.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"credits":[{"lang":"en","type":"finder","value":"Laurent GAFFIE, (secorizon.com)"}],"descriptions":[{"lang":"en","value":"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."}],"exploits":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"WatchGuard is not aware of any exploitation of this vulnerability in the wild."}],"value":"WatchGuard is not aware of any exploitation of this vulnerability in the wild."}],"metrics":[{"cvssV4_0":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"CWE-120","lang":"en","type":"CWE"},{"cweId":"CWE-121","description":"CWE-121","lang":"en","type":"CWE"},{"cweId":"CWE-787","description":"CWE-787","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-29T23:05:47.399Z","orgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","shortName":"WatchGuard"},"references":[{"tags":["vendor-advisory"],"url":"https://psirt.watchguard.com/CVE-2026-81433"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3"}],"value":"Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3"}],"title":"Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution"}},"cveMetadata":{"assignerOrgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","assignerShortName":"WatchGuard","cveId":"CVE-2026-81433","datePublished":"2026-09-29T23:05:47.399Z","dateReserved":"2026-08-26T19:25:54.228Z","dateUpdated":"2026-10-01T03:55:40.175Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-30 00:16:36","lastModifiedDate":"2026-10-01 04:18:20","problem_types":["CWE-120","CWE-121","CWE-787","CWE-120 CWE-120","CWE-121 CWE-121","CWE-787 CWE-787"],"metrics":{"cvssMetricV40":[{"source":"5d1c2695-1a31-4499-88ae-e847036fd7e3","type":"Secondary","cvssData":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-30T00:00:00+00:00","id":"CVE-2026-81433","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"81433","Ordinal":"1","Title":"Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd ","CVE":"CVE-2026-81433","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"81433","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd "}]}}}