{"id":"CVE-2026-103594","published":"2026-10-27T16:17:28Z","modified":"2026-10-28T14:39:26Z","title":"A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote…","vendor":"WatchGuard","product":"Fireware OS","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"A stack-based buffer overflow in the WireGuard configuration processing of WatchGuard's Fireware OS lets an attacker tamper with a FireCloud Gateway configuration payload and potentially run arbitrary code or cause a denial of service. Exploitation requires a man-in-the-middle position with TLS-decrypted access to the traffic between the Firebox and WatchGuard Cloud, and no authentication or user interaction is needed.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:24:51Z"},"cvss":{"score":9.5,"severity":"CRITICAL","version":"4.0","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/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","provenance":"source","from":"NVD"},"epss":{"score":0.00432,"percentile":0.37472,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":2,"pulses":[{"name":"Known_Cve | Oct 30, 2026 | Part 2/2","url":"https://otx.alienvault.com/pulse/6ae35d945cba1d70e2bf3a79","created":"2026-10-29"},{"name":"Known_Cve | Oct 29, 2026 | Part 3/3","url":"https://otx.alienvault.com/pulse/6ae20c338ef6b2d900217a8b","created":"2026-10-28"}],"provenance":"machine"},"cwes":[{"id":"CWE-121","name":"Stack-based Buffer Overflow"},{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input"}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-103594","tags":[]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-111159","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-111159","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2026-10-27","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103594","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":15.2,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":7.49,"detail":"percentile 0.3747"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":1.08,"detail":"2 pulses"},{"name":"CVSS severity","points":6.65,"detail":"base score 9.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}