---
id: "CVE-2026-103593"
kind: "vulnerability"
aliases: ["CVE-2026-103593"]
title: "WatchGuard Fireware OS: logging service overflow lets rogue log server run code"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["firewall", "fireware-os", "infrastructure", "network-appliance", "watchguard"]
not_affected_if: ["no-remote-log-server"]
published_at: "2026-10-27T16:17:28+00:00"
first_seen_at: "2026-10-27T16:33:06+00:00"
updated_at: "2026-10-27T16:34:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103593", "first_seen_at": "2026-10-27T16:33:06+00:00"}]
---

# WatchGuard Fireware OS: logging service overflow lets rogue log server run code

A stack-based buffer overflow in the Fireware OS logging service is triggered when a crafted certificate is presented by a log server the device connects to. An attacker who can impersonate or intercept traffic to that log server can run arbitrary code as root on the appliance.

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

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-27T16:33:06+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-103593

## From the sources

A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.

---

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