EUVD-2026-67338
GHSA-p5wc-v6pv-pg65
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Network-reachable IKE port, no credentials or user interaction required; impact is confined to VPN process availability with no confidentiality or integrity loss, scope unchanged.
Primary rating from Vendor (WatchGuard).
CVSS VectorVendor: WatchGuard
Lifecycle Timeline
3DescriptionCVE.org
An integer underflow 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
Remote unauthenticated denial-of-service in WatchGuard Fireware OS targets the iked process, which handles IKE-based VPN session negotiation. By sending specially crafted network packets to the IKE service, an attacker can trigger an integer underflow in iked, crashing VPN processing and disrupting all VPN-dependent connectivity without any authentication. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The iked process must be running and the IKE service reachable on UDP/500 or UDP/4500 - this is the default and primary configuration for any WatchGuard Firebox deployed for VPN purposes. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 accurately reflects the low-complexity, unauthenticated, network-accessible attack surface - any attacker who can reach the IKE service can attempt exploitation. … 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 | Consult the WatchGuard PSIRT advisory at https://psirt.watchguard.com/CVE-2026-19314 for the confirmed patched Fireware OS version and upgrade instructions; no specific fix version number is available in the current intelligence data, so the advisory is the authoritative source. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all WatchGuard Fireware appliances and verify their current OS versions; enable IKE process logging and monitoring to detect exploitation attempts. …
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Same weakness CWE-191 – Integer Underflow
View allSame technique Integer Overflow
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External POC / Exploit Code
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