CVE-2026-111853: SCPI Handler Flaw in Tektronix MDO Lets Attackers Run OS Commands
A CVSS 8.8 vulnerability in Tektronix oscilloscopes allows remote attackers to run OS commands via a specific SCPI handler before version 1.21.1.
Key points
- CVE-2026-111853 affects Tektronix 3 Series MDO devices running firmware versions prior to 1.21.1.
- The flaw is an OS command injection in the FILESystem:MOUNT:DRIve SCPI command handler.
- Successful exploitation grants attackers elevated privileges to execute arbitrary operating system commands.
The National Vulnerability Database lists CVE-2026-111853 as a high-severity flaw affecting Tektronix 3 Series MDO mixed-domain oscilloscopes. The vulnerability exists in devices running firmware versions earlier than 1.21.1 and allows remote attackers to execute arbitrary operating system commands. This issue stems from insufficient neutralization of user-supplied input within a specific command handler.
At a glance
- New CVEs (24h)
- 105
- CVSS 8.0+
- 15
- Critical (9.0+)
- 3
The defect is classified as OS command injection, corresponding to CWE-78 in the Common Weakness Enumeration. Attackers can exploit this weakness through the FILESystem:MOUNT:DRIve SCPI command handler. Because the input processing fails to properly sanitize data, malicious actors can inject and execute arbitrary commands on the host operating system. These commands run with elevated privileges, giving the attacker significant control over the device.
Vulnerability Context and Severity
This CVE was among 105 new records added to the CVE Program's public feed in a single 24-hour period, according to our data desk analysis. Of those new entries, 15 were rated CVSS 8.0 or higher, and three reached the critical threshold of 9.0 or above. Tektronix appeared twice in the list of top vendors for high-severity vulnerabilities published during this window. The other high-severity issues involved vendors such as thorsten, fleetdm, latepoint, thimpress, and wpeverest.
CVE-2026-111853 received a base score of 8.8, placing it in the high severity range. While not the highest-rated flaw in the daily batch, it remains significant due to its remote exploitability and privilege escalation potential. The highest-rated vulnerability in the same daily set was CVE-2026-104736, affecting a WordPress plugin, with a score of 9.8. Other high scores included flaws in phpMyFAQ and a LatePoint appointment booking plugin.
Affected Systems and Scope
Only Tektronix 3 Series MDO devices are currently identified as affected by this specific CVE. The vulnerability applies strictly to firmware versions before 1.21.1. The source material specifies that the issue was discovered on Tektronix 3 Series MDO devices before 1.21.1. There is no information in the provided data regarding other Tektronix product lines or different device families being vulnerable to this specific command injection flaw.
The exposure is remote, meaning an attacker does not need physical access to the oscilloscope to trigger the vulnerability. The attack vector relies on the device accepting and processing the malicious SCPI command. This remote capability increases the risk profile for networked laboratory equipment that may be accessible from external or semi-trusted networks.
What should you do?
Organizations should immediately audit their networked test equipment to identify any Tektronix 3 Series MDO units. Administrators must verify the firmware version on each device to determine if it falls below the 1.21.1 threshold. If vulnerable devices are found, they should be isolated from untrusted networks until a remediation path is clear. Monitoring for unusual command activity on the FILESystem:MOUNT:DRIve handler is also advisable.
What to do and how to stay safe: Tektronix
- Inventory all Tektronix 3 Series MDO devices on your network and record their current firmware versions.
- Compare recorded versions against the 1.21.1 threshold to identify any units running vulnerable software.
- Restrict network access for identified vulnerable devices to prevent remote exploitation via SCPI commands.
- Monitor device logs for unauthorized attempts to execute the FILESystem:MOUNT:DRIve command handler.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVSS score for CVE-2026-111853?
The vulnerability has a CVSS score of 8.8, which is rated as high severity.
Which Tektronix devices are affected by this flaw?
Tektronix 3 Series MDO devices running firmware versions before 1.21.1 are affected.
How can an attacker exploit this vulnerability?
Attackers can exploit it by sending malicious input to the FILESystem:MOUNT:DRIve SCPI command handler.
