{"id":"CVE-2026-103594","title":"Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution","summary":"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 Servi…","severity":"critical","cvss":9.5,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-121","CWE-1284","CWE-787"],"vendor":"WatchGuard","product":"Fireware OS","affected":["fireware_os >= 2026.2 < 2026.4","fireware_os >= 12.12 < 12.12.4"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T15:52:27.758Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103594","references":[{"url":"https://psirt.watchguard.com/CVE-2026-103594"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T16:11:59.474Z","slug":"CVE-2026-103594","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `fireware_os >= 2026.2 < 2026.4`\n- `fireware_os >= 12.12 < 12.12.4`\n\n## Remediation\n\nFireware OS 2026.4, Fireware OS 12.12.4","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}