EUVD-2026-67331
GHSA-j294-c4gm-rwh3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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
Network-reachable unauthenticated DoS maps to AV:N/PR:N; out-of-bounds read adds C:L for potential memory leakage; A:H reflects VPN service crash.
Primary rating from Vendor (WatchGuard).
CVSS VectorVendor: WatchGuard
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Out-of-bounds read in the WatchGuard Fireware OS iked (IKE daemon) process allows remote unauthenticated attackers to disrupt VPN operations by sending specially crafted network packets. The flaw resides in VPN processing logic and can crash or destabilize the IKE service, cutting off IPsec/IKEv2 tunnels for connected clients and sites. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required and no special configuration is needed beyond the appliance having IKE-based VPN functionality enabled, which is the standard operational mode for WatchGuard Firebox devices. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 with AV:N/AC:L/AT:N/PR:N/UI:N reflects a straightforward unauthenticated network-exploitable flaw requiring no special conditions, which represents genuine operational risk for any deployment exposing IKE/UDP 500 or 4500 to untrusted networks. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the vendor patch as documented in the WatchGuard PSIRT advisory at https://psirt.watchguard.com/CVE-2026-78009; no specific fixed version number is independently confirmed from the available intelligence, so administrators must consult the advisory directly for the exact target release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive inventory of all WatchGuard Firebox appliances in production, documenting firmware versions and the criticality of VPN services they support (e.g., remote worker access, site-to-site connectivity). …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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