---
id: "CVE-2026-112710"
kind: "vulnerability"
aliases: ["CVE-2026-112710"]
title: "WatchGuard Fireware OS: crafted Active Directory reply can crash or run code"
severity: "critical"
cvss: 9.2
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["active-directory", "firewall", "fireware-os", "infrastructure", "watchguard"]
not_affected_if: ["no-active-directory-auth"]
published_at: "2026-10-27T16:17:30+00:00"
first_seen_at: "2026-10-27T16:33:07+00:00"
updated_at: "2026-10-27T16:33:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112710", "first_seen_at": "2026-10-27T16:33:07+00:00"}]
---

# WatchGuard Fireware OS: crafted Active Directory reply can crash or run code

A heap buffer overflow in the Fireware OS authentication service is triggered when a malicious or intercepted Active Directory server returns a specially crafted response. The result is a denial of service and potentially arbitrary code execution on the firewall.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-27T16:33:07+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112710

## From the sources

A heap-based buffer overflow vulnerability exists in the Fireware OS authentication service allows an attacker who controls or intercepts traffic to the configured Active Directory server to create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_