CVE-2026-93866

Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write

An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-93434

Fireware OS XPath Injection in SSH Authentication Allows Blind Extraction of Configuration Secrets

An XPath injection vulnerability in WatchGuard Fireware OS's SSH authentication process allows a remote, unauthenticated attacker with access to the management SSH interface to extract sensitive configuration data by submitting a specially crafted request.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-90464

Fireware OS Missing Command Validation allows Authenticated Arbitrary File Modification as Root

An external control of file path vulnerability in a WatchGuard Fireware OS firewall diagnostic command allows a remote, authenticated attacker with at least read-only (Device Monitor) privileges and access to the management CLI to create, truncate, or overwrite arbitrary files and modify kernel parameters with root privileges by submitting a specially crafted command. Written content is limited to numeric values.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-90442

Fireware OS Authenticated Stack Buffer Overflow in certd Allows Denial of Service

A stack-based buffer overflow vulnerability in the Fireware OS certd process allows an authenticated attacker with access to the Firebox management interface to crash the certificate management service and potentially execute arbitrary code by sending a specially crafted request.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-82332

Fireware OS Improper Authentication in AuthPoint MFA Verification Allows Session Hijacking

An improper authentication vulnerability in WatchGuard Fireware OS's AuthPoint multi-factor authentication process allows a local, unauthenticated attacker on the appliance to hijack another user's in-progress MFA session by supplying a specially crafted request and convincing the victim user to accept an MFA push notification.

CVSS 4.0 · 5.6 Medium EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-113881

Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code Execution

A stack-based buffer overflow vulnerability in Fireware OS's VPN Network Access Enforcement process allows an authenticated mobile VPN user to create a denial of service condition and potentially execute arbitrary code as an unprivileged process by sending a specially crafted request.

CVSS 4.0 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-112710

Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code Execution

A heap-based buffer overflow vulnerability exists in the Fireware OS authentication service allows an attacker who controls or intercepts traffic to the configured Active Directory server to create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-112709

Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code Execution

A heap-based buffer overflow vulnerability in the Fireware OS authentication service allows an attacker who controls or intercepts traffic to the configured Active Directory server to create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-111107

Fireware OS NULL Pointer Dereference in Management Interface Allows Unauthenticated Denial of Service

A NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request. Repeated exploitation terminates all active administrator sessions and in-progress management operations and can prevent management of the device. Traffic processing is not affected.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-104381

Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN Tunnel Denial of Service

A missing authentication vulnerability in Fireware OS's FireCluster state synchronization feature allows an unauthenticated attacker positioned on the cluster synchronization network segment to force premature VPN tunnel termination by sending crafted cluster synchronization traffic.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-103594

Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution

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.

CVSS 4.0 · 9.5 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-93865

Fireware OS Missing Authentication in FireCluster Sync Daemon Allows Remote Root Action Injection

A missing authentication vulnerability in the Fireware OS FireCluster synchronization daemon allows a remote, unauthenticated attacker to invoke privileged system-level administrative actions by sending a specially crafted request to the FireCluster management IP when the clustering feature is enabled.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-93864

Fireware OS Link Following in firewalld Allows Local Arbitrary File Overwrite as Root

A link following vulnerability in WatchGuard Fireware OS’s firewall daemon allows a local attacker with code execution as a low-privileged system process to overwrite arbitrary files with root privileges, and to tamper with firewall IP set data, by planting a crafted file system object and triggering a list update. Written content is partially constrained.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-93857

Fireware OS Pre-Authentication Stack Buffer Overflow in SIP Proxy Allows Remote Code Execution

A stack-based buffer overflow vulnerability in Fireware OS's SIP proxy allows a remote, unauthenticated attacker to execute arbitrary code by sending a specially crafted request through a policy that uses the SIP proxy.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-90465

Fireware OS Missing Authentication in FireCluster Sync Allows Privilege Escalation

A missing authentication vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to invoke privileged firewall management actions as root by sending a specially crafted request.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-103593

Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution

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 presenting a specially crafted certificate.

CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-93862

Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of Service

An out-of-bounds read vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to repeatedly crash the firewall's cluster synchronization process by sending specially crafted network traffic, resulting in a sustained denial of service.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Os

CVE-2026-13046

Fireware OS Deserialization of Untrusted Data in samld Allows Remote Code Execution

A deserialization of untrusted data vulnerability in WatchGuard Fireware OS's SAML single sign-on session handling (samld) allows an attacker who has already obtained the ability to write files on the appliance to execute arbitrary code in the context of the samld service by causing samld to load a maliciously crafted session file.

CVSS 4.0 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Fireware Os

CVE-2026-13224

Fireware OS Path Traversal in WebUI Management Agent Allows Arbitrary Local File Read

A path traversal vulnerability in the Fireware OS WebUI management agent allows an authenticated administrator to read or list arbitrary files on the local filesystem by sending a specially crafted management request.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Fireware Os

CVE-2026-18105

Fireware OS Uncontrolled Resource Consumption in Diagnostic Tasks Allows Denial of Service

An 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.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Watchguard

Products

Fireware Fireware Os