{"api_version":"1","generated_at":"2026-08-28T03:53:55+00:00","cve":"CVE-2026-81851","urls":{"html":"https://cve.report/CVE-2026-81851","api":"https://cve.report/api/cve/CVE-2026-81851.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-81851","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81851"},"summary":{"title":"Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service","description":"A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.","state":"PUBLISHED","assigner":"WatchGuard","published_at":"2026-08-28 00:18:22","updated_at":"2026-08-28 00:18:22"},"problem_types":["CWE-122","CWE-1284","CWE-122 CWE-122","CWE-1284 CWE-1284"],"metrics":[{"version":"4.0","source":"5d1c2695-1a31-4499-88ae-e847036fd7e3","type":"Secondary","score":"6.9","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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":6.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","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":"6.9","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","data":{"baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-81851","name":"https://psirt.watchguard.com/CVE-2026-81851","refsource":"5d1c2695-1a31-4499-88ae-e847036fd7e3","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81851","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81851","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 2025.0 2026.2.1 custom","platforms":["Default"]},{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 12.0 12.12.1 custom","platforms":["Default"]},{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 12.0 12.11.9 custom","platforms":["EUCC"]},{"source":"CNA","vendor":"WatchGuard","product":"Fireware OS","version":"affected 12.0 12.5.18 custom","platforms":["T15/T35"]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18","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":"Cody Sixteen","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","platforms":["Default"],"product":"Fireware OS","vendor":"WatchGuard","versions":[{"lessThan":"2026.2.1","status":"affected","version":"2025.0","versionType":"custom"},{"lessThan":"12.12.1","status":"affected","version":"12.0","versionType":"custom"}]},{"defaultStatus":"unaffected","platforms":["EUCC"],"product":"Fireware OS","vendor":"WatchGuard","versions":[{"lessThan":"12.11.9","status":"affected","version":"12.0","versionType":"custom"}]},{"defaultStatus":"unaffected","platforms":["T15/T35"],"product":"Fireware OS","vendor":"WatchGuard","versions":[{"lessThan":"12.5.18","status":"affected","version":"12.0","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"12.11.9","versionStartIncluding":"12.0","vulnerable":true},{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"12.5.18","versionStartIncluding":"12.0","vulnerable":true},{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"2026.2.1","versionStartIncluding":"2025.0","vulnerable":true},{"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionEndExcluding":"12.12.1","versionStartIncluding":"12.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"credits":[{"lang":"en","type":"finder","value":"Cody Sixteen"}],"descriptions":[{"lang":"en","value":"A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration."}],"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":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122","lang":"en","type":"CWE"},{"cweId":"CWE-1284","description":"CWE-1284","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-27T22:58:26.855Z","orgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","shortName":"WatchGuard"},"references":[{"tags":["vendor-advisory"],"url":"https://psirt.watchguard.com/CVE-2026-81851"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18</p>"}],"value":"Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18"}],"title":"Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service"}},"cveMetadata":{"assignerOrgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","assignerShortName":"WatchGuard","cveId":"CVE-2026-81851","datePublished":"2026-08-27T22:58:26.855Z","dateReserved":"2026-08-27T16:29:07.182Z","dateUpdated":"2026-08-27T22:58:26.855Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 00:18:22","lastModifiedDate":"2026-08-28 00:18:22","problem_types":["CWE-122","CWE-1284","CWE-122 CWE-122","CWE-1284 CWE-1284"],"metrics":{"cvssMetricV40":[{"source":"5d1c2695-1a31-4499-88ae-e847036fd7e3","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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":6.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","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"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"81851","Ordinal":"1","Title":"Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of ","CVE":"CVE-2026-81851","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"81851","Ordinal":"1","NoteData":"A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.","Type":"Description","Title":"Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of "}]}}}