CVE-2026-13383

Analyzed Analyzed - Analysis Complete

Out-of-bounds Write in WatchGuard Fireware OS

Publication date: 2026-07-03

Last updated on: 2026-07-09

Assigner: WatchGuard Technologies, Inc.

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS ikestubd 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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-03

Last Modified

2026-07-09

Generated

2026-07-23

AI Q&A

2026-07-03

EPSS Evaluated

2026-07-22

NVD

CVE-2026-13383

EUVD

EUVD-2026-41453

Affected Vendors & Products

Vendor	Product	Version / Range
watchguard	fireware	From 12.1 (inc) to 12.12.1 (exc)
watchguard	fireware	From 2025.1 (inc) to 2026.2.1 (exc)
watchguard	fireware	From 12.5 (inc) to 12.5.18 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

CVE-2026-13383 is an Out-of-bounds Write vulnerability in the WatchGuard Firebox ikestubd process within the Fireware OS. This flaw allows an authenticated privileged user to execute arbitrary code by sending specially crafted requests to the Management Web UI.

It affects multiple versions of Fireware OS, including 12.1 through 12.12, 12.5 through 12.5.18, and 2025.1 through 2026.2.

The issue has been resolved in Fireware OS 2026.2.1, 12.12.1, and 12.5.x for T15 and T35 models.

Impact Analysis

This vulnerability allows an authenticated privileged user to execute arbitrary code on the affected device by sending specially crafted requests to the Management Web UI.

Because the CVSS score is 8.6, it is considered a high impact vulnerability, potentially leading to full compromise of the affected Fireware OS devices.

Affected devices include a wide range of Firebox models, which could result in unauthorized control, data breaches, or disruption of network security functions.

Compliance Impact

The provided information does not specify how the CVE-2026-13383 vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

Mitigation Strategies

To mitigate the CVE-2026-13383 vulnerability, you should upgrade your WatchGuard Fireware OS to a fixed version. The issue has been resolved in Fireware OS versions 2026.2.1, 12.12.1, and 12.5.x for T15 and T35 models.

Ensure that only trusted and authenticated privileged users have access to the Management Web UI to reduce the risk of exploitation.

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