Security Experts:

Connect with us

Hi, what are you looking for?



Critical Vulnerabilities Expose Siemens LOGO! Controllers to Attacks

Siemens’ LOGO! programmable logic controllers (PLCs) are affected by critical vulnerabilities that can be exploited remotely to launch denial-of-service (DoS) attacks and modify the device’s configuration.

Siemens’ LOGO! programmable logic controllers (PLCs) are affected by critical vulnerabilities that can be exploited remotely to launch denial-of-service (DoS) attacks and modify the device’s configuration.

According to Siemens, the vulnerabilities impact all versions of its LOGO!8 BM devices, which are designed for basic control tasks. SIPLUS versions, which are meant for use in extreme conditions, are also affected.

The German industrial giant has yet to release patches for the vulnerabilities, which have been described as missing authentication issues, but it has told customers that they can reduce the risk of exploitation by applying defense-in-depth measures.

Siemens says an unauthenticated attacker who has network access to TCP port 135 can exploit the vulnerabilities to read and modify a device’s configuration and obtain project files, without user interaction.

While the advisories published this week by Siemens and CISA mention a single vulnerability, Cisco’s Talos threat intelligence and research group, which the vendor has credited for the findings, says there are actually three missing authentication flaws tracked under the same CVE identifier, CVE-2020-7589.

Learn More About Vulnerabilities in Industrial Products at SecurityWeek’s ICS Cyber Security Conference and SecurityWeek’s Security Summits Virtual Event Series

According to advisories published by Talos, all three vulnerabilities are related to the TDE text display functionality of LOGO! products, and they can all be exploited by sending specially crafted packets to the targeted system. Talos has released technical information on what these payloads look like.

The company says two of the flaws allow an attacker to delete information on the device, causing a denial-of-service (DoS) condition. The third bug can be exploited to upload or overwrite files on the SD card, which, Talos says, can impact the device’s integrity and availability.

Related: Siemens Industrial Devices Affected by ‘SegmentSmack’ Linux Kernel Flaw

Related: Siemens Addresses Vulnerabilities in LOGO, SINAMICS Products

Related: Siemens Patches Serious DoS Vulnerabilities in Several Products

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join this webinar to learn best practices that organizations can use to improve both their resilience to new threats and their response times to incidents.


Join this live webinar as we explore the potential security threats that can arise when third parties are granted access to a sensitive data or systems.


Expert Insights

Related Content


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...


Apple has released updates for macOS, iOS and Safari and they all include a WebKit patch for a zero-day vulnerability tracked as CVE-2023-23529.

Application Security

Drupal released updates that resolve four vulnerabilities in Drupal core and three plugins.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

IoT Security

Lexmark warns of a remote code execution (RCE) vulnerability impacting over 120 printer models, for which PoC code has been published.

Application Security

A CSRF vulnerability in the source control management (SCM) service Kudu could be exploited to achieve remote code execution in multiple Azure services.

CISO Strategy

Cybersecurity-related risk is a top concern, so boards need to know they have the proper oversight in place. Even as first-timers, successful CISOs make...