Schneider Electric Modicon M580 communication modules stack overflow
Free public brief. The indicators, the detections with Splunk SPL already written (plus Elastic and KQL where they apply), and a Slack alert the next time this touches a vendor you run are in the app — free account, no card.
Stack overflow in Schneider Electric communication modules via VxWorks DHCP server; patch available, no active exploitation reported.
Schneider Electric communication modules for Modicon M580 and Quantum controllers contain an out-of-bounds write vulnerability (CVE-2021-29999) in the VxWorks DHCP server. The flaw allows remote unauthenticated attackers with low complexity to trigger a stack overflow, potentially compromising confidentiality, integrity, and availability of affected devices. CVSS v4 score is 9.3 (critical). Affected modules include BMENOC0321, BMECRA31210, BMXCRA31200, BMXCRA31210, 140CRA31200, and 140CRA31908 in versions prior to specified patch levels. CISA confirms no known public exploitation at the time of publication. Mitigation requires updating to patched firmware versions and implementing network segmentation to isolate control systems from business networks.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-058-01
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 its extracted indicators, its detections (Splunk SPL already written, plus Elastic and Microsoft KQL where they apply), the actors and CVEs it names as live profiles, and the vendor research on the same campaign — the primary source the news paraphrased, cited and read directly.
It sits in a corpus of 13,854 reports from 146 sources, 616 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. Name the vendors you run and Slack hears about the reports that touch them — about forty a week that are yours, not the four hundred that are not.
Create a free account What it costs