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WatchGuard Fireware OS CVE-2026-13050

| EUVDEUVD-2026-41462 HIGH
Out-of-bounds Write (CWE-787)
2026-07-02 WatchGuard GHSA-j5qg-7rp2-rw7j
Memory Corruption Watchguard Buffer Overflow RCE Fireware Os
8.6
CVSS 4.0 · Vendor: WatchGuard
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Severity by source

Vendor (WatchGuard) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.2 HIGH

Network-reachable Management Web UI with no user interaction, but requires privileged admin access (PR:H); full code execution yields high C/I/A with no scope change.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (WatchGuard).

CVSS VectorVendor: WatchGuard

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 02, 2026 - 23:55 vuln.today

DescriptionCVE.org

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS networkd process could allow an authenticated privileged user to execute arbitrary code via a specially crafted requests to the Management Web UI.This vulnerability affects Fireware OS 11.8 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.

AnalysisAI

Remote code execution in WatchGuard Fireware OS (the operating system powering Firebox network security appliances) allows an authenticated privileged administrator to run arbitrary code on the firewall by sending specially crafted requests to the Management Web UI, which trigger an out-of-bounds write in the networkd process. The flaw spans a wide version range (11.8 through 11.12.4_Update1, 12.0 through 12.12, and 2025.1 through 2026.2) and carries a CVSS 4.0 base score of 8.6 (High). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain privileged admin credentials
Delivery
Authenticate to Management Web UI
Exploit
Send crafted request to networkd
Execution
Trigger out-of-bounds write
Impact
Execute arbitrary code on appliance
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Vulnerability AssessmentAI

Exploitation Exploitation requires authenticated access as a privileged (administrative) user to the Fireware OS Management Web UI, per CVSS PR:H - this is the primary limiting factor and rules out anonymous exploitation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N) indicates a network-reachable, low-complexity attack with no user interaction, but critically PR:H means the attacker must already hold high (administrative) privileges on the device, which substantially narrows the realistic threat to compromised or malicious admin credentials rather than anonymous internet attackers. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained WatchGuard Firebox administrator credentials (via phishing, credential reuse, or an insider) authenticates to the Management Web UI and submits a specially crafted request that overflows a buffer in the networkd process. The out-of-bounds write is manipulated to execute attacker-controlled code on the appliance, giving the attacker control-plane execution on the firewall itself. …
Remediation Consult WatchGuard PSIRT advisory WGSA-2026-00029 (https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00029) and upgrade Fireware OS to the fixed release identified there for your branch; the input data does not include an exact fixed version number, so the specific target build must be taken from the advisory and not invented. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all WatchGuard Firebox appliances and document Fireware OS versions to identify affected systems. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Same weakness CWE-787 – Out-of-bounds Write

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CVE-2026-13050 vulnerability details – vuln.today
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