---
id: CVE-2026-111854
title: An issue was discovered on Tektronix 3 Series MDO devices before 1.21.1
summary: >-
  An issue was discovered on Tektronix 3 Series MDO devices before 1.21.1. A
  path traversal vulnerability in the SCPI FILESystem command interface allows
  remote attackers to read or modify arbitrary files on the device through
  insufficient…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: Tektronix
product: 3 Series MDO
affected:
  - 3_series_mdo < 1.21.1
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T02:08:50.037Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111854'
references:
  - url: 'https://www.tek.com/en/products/oscilloscopes/3-series-mdo'
  - url: 'https://download.tek.com/document/TEK-PSA-002-092026.pdf'
tags:
  - cve.org
ingestedAt: '2026-10-17T02:57:58.443Z'
epss: 0.00391
epssPercentile: 0.31646
---

## Overview

An issue was discovered on Tektronix 3 Series MDO devices before 1.21.1. A path traversal vulnerability in the SCPI FILESystem command interface allows remote attackers to read or modify arbitrary files on the device through insufficient validation of file paths supplied to filesystem access commands.

## Affected

- `3_series_mdo < 1.21.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.