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WatchGuard Fireware OS CVE-2026-13384

| EUVDEUVD-2026-41454 HIGH
Out-of-bounds Write (CWE-787)
2026-07-02 WatchGuard GHSA-6xrf-cr85-wvqp
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 UI with low complexity, but requires an authenticated privileged admin (PR:H); memory-corruption code execution yields full C/I/A impact on the appliance 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 - 23:52 vuln.today

DescriptionCVE.org

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS wgagent 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 12.1 up to and including 12.12 and 2025.1 up to and including 2026.2.

AnalysisAI

Authenticated arbitrary code execution in WatchGuard Fireware OS (12.1-12.12 and 2025.1-2026.2) arises from an out-of-bounds write in the wgagent process, reachable when a privileged user sends specially crafted requests to the Management Web UI. A high-privilege attacker (or one who has compromised admin credentials) can corrupt memory to run code on the firewall appliance, undermining the security gateway itself. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain privileged admin access to Firebox
Delivery
Reach Management Web UI over network
Exploit
Send crafted management request
Execution
Trigger out-of-bounds write in wgagent
Persist
Corrupt memory and hijack control flow
Impact
Execute arbitrary code on appliance
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated privileged (administrator) account on the Firebox and network reachability to the Management Web UI, which must accept the specially crafted requests processed by the wgagent backend. … 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, VC:H/VI:H/VA:H, base 8.6 High) signals network-reachable, low-complexity exploitation with full confidentiality, integrity and availability impact on the vulnerable system, but crucially requires high privileges (PR:H) - the attacker must already be an authenticated privileged administrator, which is the primary factor holding this below critical. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained or been granted privileged administrator access to a Firebox (via credential theft, reuse, or a malicious insider) sends a specially crafted request to the Management Web UI, triggering the out-of-bounds write in wgagent and executing arbitrary code on the appliance. Because AC:L indicates low complexity, a reliable exploit would be straightforward to reuse once developed, though no public POC is currently known.
Remediation Upgrade Fireware OS to the fixed release identified in WatchGuard PSIRT advisory WGSA-2026-00021 (https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00021); the input does not include a specific fixed version number, so treat patch status as available per vendor advisory and confirm the exact patched build for your branch (12.x versus 2025.1/2026.x) directly from that advisory before deploying. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all WatchGuard Fireware deployments and identify affected versions (12.1-12.12 and 2025.1-2026.2); implement network-level IP whitelisting to restrict Management Web UI access to trusted administrator networks only. …

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

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CVE-2026-13384 vulnerability details – vuln.today
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