Icefall is Here Again, Two Critical Vulnerabilities found in Schneider Electric’s Modicon

Schneider Electric modicon

Security researchers recently found vulnerabilities in Schneider Electric’s Modicon line of products and the potential impact they may have on organizations using these devices. In this article, we will explore the risks associated with these vulnerabilities and provide recommendations for how organizations can mitigate them.

Schneider Electric’s Modicon line of products is widely used in a variety of critical infrastructure and industrial control systems. However, these products have recently been found to be vulnerable to multiple security flaws. Cybersecurity firm Forescout has discovered a collection of vulnerabilities, which they have named “Icefall.” In this article, we will discuss the Icefall vulnerabilities in detail and explore the potential impact they could have on organizations that use these products. We will also provide recommendations for how organizations can mitigate the risks associated with these vulnerabilities.

What are the Icefall Vulnerabilities?

The Icefall vulnerabilities are a collection of security flaws that affect multiple Modicon products, including Modicon M221, M241, and M251 Programmable Logic Controllers (PLCs), as well as the Modicon M262 Motion Controller. These vulnerabilities could allow an attacker to take control of the device, steal data, or cause other disruptive actions.

The vulnerabilities in the Modicon products are the result of poor coding practices and lack of proper security testing. The products contain a number of software vulnerabilities, including buffer overflows, hard-coded credentials, and unauthenticated network services. These vulnerabilities could be exploited by an attacker to gain unauthorized access to the device and the network it is connected to.

What is the Potential Impact of the Icefall Vulnerabilities?

The potential impact of the Icefall vulnerabilities is significant. Modicon PLCs are widely used in critical infrastructure and industrial control systems, such as manufacturing plants, power plants, and water treatment facilities. If these devices are compromised, it could cause significant disruptions to industrial processes, which could have serious consequences for organizations and potentially even for public safety.

Attackers who gain control of these devices could manipulate the operations of the industrial process, causing damage to equipment or even human harm. For instance, attackers could disable safety protocols or cause critical systems to fail, leading to explosions, chemical spills, or even power outages.

How Can Organizations Mitigate the Risks Associated with the Icefall Vulnerabilities?

To mitigate the risks associated with the Icefall vulnerabilities, we recommend that organizations take the following steps:

  1. Update Modicon Devices: Schneider Electric has released firmware updates to address the Icefall vulnerabilities in its Modicon devices. Organizations should ensure that all Modicon devices are running the latest firmware version.
  2. Segment Networks: Organizations should segment their networks to prevent attackers from moving laterally across the network in the event that a Modicon device is compromised. Network segmentation can also limit the damage caused by a successful attack.
  3. Implement Strong Authentication: Organizations should require strong authentication, such as two-factor authentication, for all Modicon device access. This will make it harder for attackers to gain unauthorized access to the device.
  4. Monitor Network Traffic: Organizations should monitor their network traffic for any signs of compromise or malicious activity, including unusual network traffic patterns or unauthorized access attempts. Early detection of suspicious activity can help prevent a successful attack.
  5. Perform Regular Security Assessments: Organizations should perform regular security assessments to identify potential vulnerabilities in their networks and systems, including Modicon devices. Regular security assessments can help identify security gaps before they are exploited by attackers.


The Icefall vulnerabilities in Schneider Electric’s Modicon products pose a significant risk to organizations that use these devices. To mitigate these risks, organizations should take steps to ensure that their Modicon devices are up-to-date, their networks are properly segmented, strong authentication is in place, and they regularly monitor their network traffic and perform security assessments. By following these recommendations, organizations can reduce the risk of a potential

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