{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-78011", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "state": "PUBLISHED", "assignerShortName": "WatchGuard", "dateReserved": "2026-08-21T21:46:48.681Z", "datePublished": "2026-08-27T23:24:33.126Z", "dateUpdated": "2026-08-27T23:24:33.126Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-08-27T23:24:33.126Z"}, "title": "Fireware OS Integer Underflow in Iked Allows Unauthenticated Denial of Service (DoS)", "descriptions": [{"lang": "en", "value": "An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic."}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.0", "versionType": "custom", "lessThan": "2026.2.2"}, {"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.12.2"}], "defaultStatus": "unaffected", "platforms": ["Default"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.5.20"}], "defaultStatus": "unaffected", "platforms": ["T15/T35"]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-78011", "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": "12.5.20"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.0", "versionEndExcluding": "2026.2.2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.12.2"}]}]}], "metrics": [{"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "baseScore": 8.7, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-191", "type": "CWE", "cweId": "CWE-191"}, {"lang": "en", "description": "CWE-787", "type": "CWE", "cweId": "CWE-787"}]}], "credits": [{"lang": "en", "value": "Discovered Internally by WatchGuard AI Security Research", "type": "finder"}], "configurations": [{"lang": "en", "value": "This vulnerability is exploitable on systems where a Branch Office VPN with IKEv1 is configured.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This vulnerability is exploitable on systems where a Branch Office VPN with IKEv1 is configured.</p>"}]}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20"}]}], "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."}]}]}}}

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