CVE-2026-19314
Received Received - Intake

Integer Underflow in WatchGuard Fireware OS iked Process Triggers DoS

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: WatchGuard Technologies, Inc.

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-19314
EUVD
EUVD-2026-67338

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
watchguard fireware_os From 2025.0 (inc) to 2026.2.2 (exc)
watchguard fireware_os From 12.0 (inc) to 12.12.2 (exc)
watchguard fireware_os to 12.5.20 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-191 The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

CVE-2026-19314 is an integer underflow vulnerability in WatchGuard Fireware OS's iked process. It allows a remote unauthenticated attacker to send specially crafted network traffic that could cause a Denial of Service (DoS) in VPN processing by triggering a buffer overflow in the IKE daemon.

Detection Guidance

Monitor VPN service logs for unusual traffic patterns or crashes in the iked process. Check Fireware OS version against affected ranges (2025.0 to <2026.2.2, 12.0 to <12.12.2, or T15/T35 models <12.5.20). Use network traffic analysis tools to detect malformed IKE packets.

Impact Analysis

This vulnerability could allow attackers to disrupt VPN services, causing network outages or degraded performance. It may lead to system crashes or instability in affected WatchGuard Fireware OS versions, impacting secure remote access and communications.

Mitigation Strategies

Upgrade Fireware OS to versions 2026.2.2, 12.12.2, or 12.5.20 or later. If immediate upgrade isn't possible, restrict VPN access via firewall rules until patched. Monitor iked process stability and VPN service availability.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-19314. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart