---
title: "CVE-2026-111853: Tektronix 3 Series MDO - Command Injection"
description: "Tektronix 3 Series MDO < 1.21.1 contains a command injection caused by insufficient neutralization of user input in FILESystem:MOUNT:DRIve SCPI command handler, letting remote attackers execute OS commands with elevated privileges, exploit requires remote access to SCPI commands."
url: https://panop.io/threat-heartbeat/CVE-2026-111853/
---

# CVE-2026-111853 Tektronix 3 Series MDO - Command Injection

Tektronix 3 Series MDO < 1.21.1 contains a command injection caused by insufficient neutralization of user input in FILESystem:MOUNT:DRIve SCPI command handler, letting remote attackers execute OS commands with elevated privileges, exploit requires remote access to SCPI commands.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.86% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111853)

## Details

Type

Command Injection

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

17 October 2026

Updated

19 October 2026

Weakness

[CWE-78](https://cwe.mitre.org/data/definitions/78.html)

## Vendor fix

Update to version 1.21.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111853](https://nvd.nist.gov/vuln/detail/CVE-2026-111853)
- [https://download.tek.com/document/TEK-PSA-002-092026.pdf](https://download.tek.com/document/TEK-PSA-002-092026.pdf)
- [https://www.tek.com/en/products/oscilloscopes/3-series-mdo](https://www.tek.com/en/products/oscilloscopes/3-series-mdo)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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