Watchguard Fireware vulnerabilities, page 4

75 vulnerabilities

Known vulnerabilities in Watchguard Fireware, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

8.2HighCVE-2026-86128watchguard · fireware +1 moreFireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Denial of ServiceA NULL pointer dereference vulnerability in Fireware OS's NetFlow packet-processing feature allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted IPv6 packet.EPSS0.36%8.2HighCVE-2026-86133watchguard · fireware +1 moreFireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of ServiceAn integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.EPSS0.35%9.8CriticalCVE-2026-86131watchguard · fireware +1 moreFireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code ExecutionA code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.EPSS0.42%7.2HighCVE-2026-86101watchguard · fireware +1 moreFireware OS Authorization Bypass in SAML Login Allows Unauthorized SSLVPN AccessAn improper authorization vulnerability in WatchGuard Fireware OS's SAML login process allows a remote, authenticated SAML user with access only to the Access Portal to obtain unauthorized Mobile VPN with SSL access through a specially crafted request.EPSS0.22%8.1HighCVE-2026-86136watchguard · fireware +1 moreFireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant AA 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.EPSS0.30%7.1HighCVE-2026-4315watchguard · fireware +1 moreWatchGuard Firebox Cross-Site Request Forgery (CSRF) in Fireware Web UIA Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.EPSS0.24%8.4HighCVE-2026-4266watchguard · fireware +1 moreWatchGuard Firebox Insecure Deserialization in Fireware Access PortalAn Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.EPSS0.39%7.1HighCVE-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%8.6HighCVE-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%8.1HighCVE-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%8.8HighCVE-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%6.1MediumCVE-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%8.6HighCVE-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%8.6HighCVE-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%6.9MediumCVE-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%