Schneider switches vulnerable to RADIUS forgery attacks
A RADIUS protocol flaw in Schneider Electric Modicon managed switches allows forgery attacks when Message Authenticator is disabled, risking denial of service and data integrity loss.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
Schneider Electric disclosed CVE-2024-3596, a RADIUS protocol vulnerability affecting all versions of its Modicon Network Managed Switches, Connexium Managed Switches, and Modicon Redundancy Switches. The vulnerability enables forgery attacks against RADIUS authentication responses, potentially allowing attackers to modify Access-Accept, Access-Reject, or Access-Challenge messages. Successful exploitation could result in denial of service conditions and compromise the confidentiality and integrity of devices connected to affected switches.
The flaw stems from improper enforcement of message integrity during transmission and only manifests when the RADIUS Server Message Authenticator option is disabled from its secure default state. The vulnerability affects critical infrastructure across commercial facilities, energy, food and agriculture, government, transportation, and water sectors deployed globally. Schneider Electric emphasizes that default configurations are not vulnerable, as the Message Authenticator option is enabled by default.
Schneider Electric recommends organizations maintain the default RADIUS configuration with Message Authenticator enabled. For affected products, the setting can be verified and configured via CLI commands or SNMP MIB parameters specific to each product line. CISA reinforces standard ICS security practices including network isolation, firewall deployment, secure remote access via updated VPNs, and defense-in-depth strategies for industrial control systems.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-160-01
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,436 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs