CVE-2026-81851

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81851", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "state": "PUBLISHED", "assignerShortName": "WatchGuard", "dateReserved": "2026-08-27T16:29:07.182Z", "datePublished": "2026-08-27T22:58:26.855Z", "dateUpdated": "2026-08-28T15:57:26.539Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-08-27T22:58:26.855Z"}, "title": "Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service", "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."}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.0", "versionType": "custom", "lessThan": "2026.2.1"}, {"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.12.1"}], "defaultStatus": "unaffected", "platforms": ["Default"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.11.9"}], "defaultStatus": "unaffected", "platforms": ["EUCC"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.5.18"}], "defaultStatus": "unaffected", "platforms": ["T15/T35"]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-81851", "tags": ["vendor-advisory"]}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.11.9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.5.18"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.0", "versionEndExcluding": "2026.2.1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.12.1"}]}]}], "metrics": [{"cvssV4_0": {"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", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-122", "type": "CWE", "cweId": "CWE-122"}, {"lang": "en", "description": "CWE-1284", "type": "CWE", "cweId": "CWE-1284"}]}], "credits": [{"lang": "en", "value": "Cody Sixteen", "type": "finder"}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18</p>"}]}], "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."}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-28T14:33:09.128484Z", "id": "CVE-2026-81851", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-28T15:57:26.539Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-81851", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "state": "PUBLISHED", "assignerShortName": "WatchGuard", "dateReserved": "2026-08-27T16:29:07.182Z", "datePublished": "2026-08-27T22:58:26.855Z", "dateUpdated": "2026-08-28T15:57:26.539Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-08-27T22:58:26.855Z"}, "title": "Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service", "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."}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.0", "versionType": "custom", "lessThan": "2026.2.1"}, {"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.12.1"}], "defaultStatus": "unaffected", "platforms": ["Default"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.11.9"}], "defaultStatus": "unaffected", "platforms": ["EUCC"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.5.18"}], "defaultStatus": "unaffected", "platforms": ["T15/T35"]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-81851", "tags": ["vendor-advisory"]}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.11.9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.5.18"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.0", "versionEndExcluding": "2026.2.1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.12.1"}]}]}], "metrics": [{"cvssV4_0": {"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", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-122", "type": "CWE", "cweId": "CWE-122"}, {"lang": "en", "description": "CWE-1284", "type": "CWE", "cweId": "CWE-1284"}]}], "credits": [{"lang": "en", "value": "Cody Sixteen", "type": "finder"}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Fireware OS 2026.2.1, Fireware OS 12.12.1, Fireware OS 12.11.9, Fireware OS 12.5.18</p>"}]}], "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."}]}]}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-81851", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-28T14:33:09.128484Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-28T14:33:10.264Z"}}]}}

{"affected": [{"affectedData": [{"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"}]}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}], "cveTags": [], "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."}], "id": "CVE-2026-81851", "lastModified": "2026-08-28T20:20:14.080", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-81851", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-28T14:33:09.128484Z", "version": "2.0.3"}}]}, "published": "2026-08-28T00:18:22.687", "references": [{"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "url": "https://psirt.watchguard.com/CVE-2026-81851"}], "sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-1284"}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[2025.0,2026.2.1)"}}, {"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.12.1)"}}, {"platform": ["eucc"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.11.9)"}}, {"platform": ["t15/t35"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.5.18)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "fireware_os", "vendor": "watchguard"}, {"configurations": [{"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[2025.0,2026.2.1)"}}, {"platform": ["default"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.12.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Fireware OS", "source": "cna", "vendor": "WatchGuard"}, "product": "fireware_os", "vendor": "watchguard"}, {"configurations": [{"platform": ["eucc"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.11.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Fireware OS", "source": "cna", "vendor": "WatchGuard"}, "product": "fireware_os", "vendor": "watchguard"}, {"configurations": [{"platform": ["t15/t35"], "status": "affected", "versions": {"scheme": "generic", "value": "[12.0,12.5.18)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Fireware OS", "source": "cna", "vendor": "WatchGuard"}, "product": "fireware_os", "vendor": "watchguard"}], "created": "2026-08-28T08:00:12.697715+00:00", "updated": "2026-08-28T09:15:05.633956+00:00", "vendors": ["watchguard", "watchguard$PRODUCT$fireware_os"]}