Schneider Electric Easergy MiCOM Px40 Series
Schneider Electric Easergy MiCOM Px40 Series has a CVE-2026-4832 vulnerability.
Schneider Electric has identified a vulnerability (CVE-2026-4832) in its Easergy MiCOM Px40 Series protection relays. This flaw, stemming from the use of hard-coded credentials, could allow unauthenticated attackers to gain unauthorized access to basic device identification information via the SNMP protocol. Affected versions span multiple sub-series, and mitigations include network isolation, firewalling, VPN usage, or firmware upgrades to disable SNMP.
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The lesson from this incident
Full lessonThe Schneider Electric Easergy MiCOM Px40 Series vulnerability highlights a critical failure in secure-by-design principles: hard-coded credentials embedded in operational technology (OT) firmware give attackers a permanent, unchangeable foothold that no password policy can fix. Because these relays operate over SNMP — a protocol known for weak authentication — unauthenticated attackers on the same network can silently enumerate device information without triggering obvious alarms. This matters because protection relays are safety-critical components in electrical infrastructure; even reconnaissance-level access can inform more destructive follow-on attacks. The widespread version range affected suggests the flaw was baked in during development and propagated across an entire product family, amplifying the blast radius significantly.
What helps against this
How we list vendors- Automated patch management
Known holes get closed in days, not months.
- Network segmentation and microsegmentation
One compromised machine can no longer reach everything else.
- OT and industrial control system security
Factory, building and utility control systems get visibility and protection.
Indicators of Compromise
Extracted by AI from the linked source. Not reviewed by an editor. How this works
- cve — CVE-2026-4832