{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-103594","assignerOrgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","state":"PUBLISHED","assignerShortName":"WatchGuard","dateReserved":"2026-09-30T22:34:27.457Z","datePublished":"2026-10-27T15:52:27.758Z","dateUpdated":"2026-10-27T15:52:27.758Z"},"containers":{"cna":{"providerMetadata":{"orgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","shortName":"WatchGuard","dateUpdated":"2026-10-27T15:52:27.758Z"},"title":"Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution","descriptions":[{"lang":"en","value":"A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload."}],"affected":[{"vendor":"WatchGuard","product":"Fireware OS","versions":[{"status":"affected","version":"2026.2","versionType":"custom","lessThan":"2026.4"},{"status":"affected","version":"12.12","versionType":"custom","lessThan":"12.12.4"}],"defaultStatus":"unaffected","platforms":["Default"]}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-103594","tags":["vendor-advisory"]}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"2026.2","versionEndExcluding":"2026.4"},{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"12.12","versionEndExcluding":"12.12.4"}]}]}],"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:H/SI:H/SA:H","baseScore":9.5,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-121","type":"CWE","cweId":"CWE-121"},{"lang":"en","description":"CWE-1284","type":"CWE","cweId":"CWE-1284"},{"lang":"en","description":"CWE-787","type":"CWE","cweId":"CWE-787"}]}],"credits":[{"lang":"en","value":"WatchGuard AI Security Research","type":"finder"}],"configurations":[{"lang":"en","value":"This vulnerability affects Firebox deployments configured to act as a FireCloud Gateway.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>This vulnerability affects Firebox deployments configured to act as a FireCloud Gateway.</p>"}]}],"solutions":[{"lang":"en","value":"Fireware OS 2026.4, Fireware OS 12.12.4","supportingMedia":[{"type":"text/html","base64":false,"value":"Fireware OS 2026.4, Fireware OS 12.12.4"}]}],"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."}]}]}}}