Watchguard Fireware OS vulnerabilities, page 4
74 vulnerabilities
Known vulnerabilities in Watchguard Fireware OS, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.
HighCVE-2026-18105watchguard · fireware +1 moreFireware OS Uncontrolled Resource Consumption in Diagnostic Tasks Allows Denial of ServiceAn uncontrolled resource consumption vulnerability in Fireware OS's diagnostic tasks feature allows a low-privileged, authenticated user to cause a denial of service of the system's diagnostic tools by repeatedly starting and aborting a specially crafted diagnostic task through the web UI.EPSS0.24%HighCVE-2026-18145watchguard · fireware +1 moreFireware OS Stack-based Buffer Overflow in spamd Allows Remote Code ExecutionA stack-based buffer overflow vulnerability in the spamBlocker (spamd) service of WatchGuard Fireware OS allows an authenticated attacker with administrator privileges to crash the service or potentially execute arbitrary code by sending a specially crafted management request.EPSS0.39%HighCVE-2026-90441watchguard · fireware +1 moreFireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant BA missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.EPSS0.23%HighCVE-2026-81433watchguard · fireware osFireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code ExecutionA stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.EPSS0.20%MediumCVE-2026-81851watchguard · fireware osFireware OS Heap-Based Buffer Overflow in iked Allows Denial of ServiceA heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.EPSS0.41%HighCVE-2026-78010watchguard · fireware osFireware OS Stack-Based Buffer Overflow in iked Allows Unauthenticated Denial of ServiceA stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process iallows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.EPSS0.54%HighCVE-2026-78009watchguard · fireware osFireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.EPSS0.54%HighCVE-2026-78008watchguard · fireware osFireware OS Authenticated Buffer Overflow in wgagentA buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic.EPSS0.61%HighCVE-2026-78011watchguard · fireware osFireware OS Integer Underflow in Iked Allows Unauthenticated Denial of Service (DoS)An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.EPSS0.54%HighCVE-2026-8247watchguard · fireware +1 moreWatchGuard Firebox admd Out of Bounds Write VulnerabilityAn Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code.
This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.EPSS0.38%MediumCVE-2026-3343watchguard · fireware +1 moreWatchGuard Firebox Reflected Cross-Site-Scripting (XSS) Vulnerability in Fireware Web UIA reflected cross-site scripting (XSS) vulnerability in the Fireware OS Web UI enabled execution of malicious JavaScript in the context of an authenticated management user's browser when they click on a specially crafted link.EPSS0.34%HighCVE-2026-3342watchguard · fireware +1 moreWatchGuard Firebox Out of Bounds Write VulnerabilityAn Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface.
This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.EPSS0.72%HighCVE-2026-3987watchguard · fireware +1 moreWatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UIA path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.EPSS1.06%MediumCVE-2026-3344watchguard · fireware +1 moreWatchGuard Firebox System Integrity Check BypassA vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS filesystem integrity check and maintain limited persistence via a maliciously-crafted firmware update package.EPSS0.46%