{"affected":[{"defaultStatus":"unaffected","platforms":["Default"],"product":"Fireware OS","source":"CNA: WatchGuard","vendor":"WatchGuard","versions":[{"lessThan":"2026.4","status":"affected","version":"2026.2","versionType":"custom"},{"lessThan":"12.12.4","status":"affected","version":"12.12","versionType":"custom"}]}],"cveId":"CVE-2026-103594","cwes":["CWE-121","CWE-1284","CWE-787"],"description":"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.","epss":{"date":"2026-11-04","percentile":0.37649,"score":0.00432},"exploits":[],"kev":null,"metrics":[{"score":9.5,"severity":"critical","source":"CNA: WatchGuard","vector":"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","version":"4.0"}],"modifiedAt":1793824017803,"publishedAt":1793116347758,"references":[{"source":"CNA: WatchGuard","tags":["vendor-advisory"],"url":"https://psirt.watchguard.com/CVE-2026-103594"}],"remediation":[{"kind":"fix","source":"CNA: WatchGuard","text":"Fireware OS 2026.4, Fireware OS 12.12.4"}],"revision":"94a46fb97799d4ef4ec7064650d2322af3d8c01014b77d2d0ccfe50e537bfe95","sources":[{"modifiedAt":1793824017803,"name":"CNA: WatchGuard","retrievedAt":1793826517866,"url":"https://www.cve.org/CVERecord?id=CVE-2026-103594"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793826529029,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103594"}],"ssvc":{"assessedAt":1793817955878,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution","updatedAt":1793826529029}