---
id: "CVE-2026-109813"
kind: "vulnerability"
aliases: ["CVE-2026-109813"]
title: "Moxa industrial computers: hard-coded key in sysman lets attackers read traffic"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["industrial-computers", "infrastructure", "moxa", "ot"]
not_affected_if: []
published_at: "2026-10-16T03:18:02+00:00"
first_seen_at: "2026-10-23T21:57:12+00:00"
updated_at: "2026-10-25T03:00:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109813", "first_seen_at": "2026-10-23T21:57:12+00:00"}]
---

# Moxa industrial computers: hard-coded key in sysman lets attackers read traffic

Some Moxa industrial computers ship a hard-coded cryptographic private key in the /usr/bin/sysman binary. An attacker on an adjacent network can use that key to compromise the confidentiality and integrity of communications with the device.

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

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109813

## From the sources

A hard-coded cryptographic key vulnerability exists in the `/usr/bin/sysman` of some of Moxa's industrial computing products. An unauthenticated attacker with adjacent network access could exploit the exposed private key material to compromise the confidentiality and integrity of communications.

---

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