# CVE-2026-111853: Tektronix 3 Series MDO OS command injection via SCPI

Source: https://junglewise.ai/threats/cve-2026-111853-an-issue-was-discovered-on-tektronix-3-series-mdo-devices-before  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-17. Updated: 2026-10-17  
License: CC BY 4.0 with a link back

CVE-2026-111853 · Severity: high · CVSS 8.8 · Published 2026-10-17

Tektronix 3 Series MDO is a mixed-domain oscilloscope used in electronics testing and measurement. A remote attacker can inject and execute arbitrary operating system commands with elevated privileges by sending a crafted SCPI command over the network, potentially gaining complete control of the device.

Technologies: [Tektronix 3 Series MDO](https://junglewise.ai/threats/technologies/3-series-mdo). Vendors: [Tektronix](https://junglewise.ai/threats/vendors/tektronix).

## Quick answers

**Is CVE-2026-111853 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111853 being exploited in the wild.

**How severe is CVE-2026-111853?** High severity, with a CVSS score of 8.8, published 17 October 2026.

**Which products and versions are affected?** Tektronix 3 Series MDO before 1.21.1.

**Is there a fix for CVE-2026-111853?** Yes: fixed in 1.21.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111853 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-111853?** Check whether you run Tektronix 3 Series MDO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.21.1

## Technical details

The vulnerability is an OS command injection in the FILESystem:MOUNT:DRIve SCPI command handler caused by insufficient input sanitization. A remote attacker can exploit this to execute arbitrary OS commands with elevated privileges; no authentication or user interaction is required. A fix is available in version 1.21.1 and later.

## Affected products

- Tektronix 3 Series MDO before 1.21.1

## Timeline

- 2026-10-17: disclosed

## References

- [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)

## Related threats

- [Tektronix 3 Series MDO path traversal in web management](https://junglewise.ai/threats/cve-2026-111855-an-issue-was-discovered-on-tektronix-3-series-mdo-devices-before)
- [Tektronix 3 Series MDO path traversal in SCPI FILESystem](https://junglewise.ai/threats/cve-2026-111854-an-issue-was-discovered-on-tektronix-3-series-mdo-devices-before)