{"id":"CVE-2026-103593","title":"Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution","summary":"A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by pre…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H","cvssSource":"cna","cwe":["CWE-121","CWE-787"],"vendor":"WatchGuard","product":"Fireware OS","affected":["fireware_os >= 2025.1 < 2026.4","fireware_os >= 12.0 < 12.12.4","fireware_os >= 12.0 < 12.5.22"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T15:52:28.244Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103593","references":[{"url":"https://psirt.watchguard.com/CVE-2026-103593"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T16:11:59.478Z","slug":"CVE-2026-103593","body":"## Overview\n\nA stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.\n\n## Affected\n\n- `fireware_os >= 2025.1 < 2026.4`\n- `fireware_os >= 12.0 < 12.12.4`\n- `fireware_os >= 12.0 < 12.5.22`\n\n## Remediation\n\nFireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}