PT-2018-11: Buffer Overflow in PHOENIX CONTACT FL SWITCH

Vulnerable products

PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx
Firmware version: 1.33 and earlier


Severity level

Severity level: High
Impact: Arbitrary Code Execution
Access Vector: Remote

CVSS v3:
Base Score: 8.1
Vector: (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

CVE: CVE-2018-10728

Vulnerability description

The specialists of the Positive Research center have detected a Buffer Overflow vulnerability in PHOENIX CONTACT FL SWITCH.

Buffer overflows in Phoenix Contact managed FL SWITCH allow attackers to cause a denial of service, execute arbitrary code, or disable Web and Telnet services.

How to fix

Update firmware to the latest version

Advisory status

22.02.2018 - Vendor gets vulnerability details
16.05.2018 - Vendor releases fixed version and details
29.08.2018 - Public disclosure


The vulnerability was detected by Evgeny Druzhinin, Ilya Karpov, Georgy Zaytsev, Positive Research Center (Positive Technologies Company)


Reports on the vulnerabilities previously discovered by Positive Research:

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+