CVE-2021-22714 Overview
CVE-2021-22714 is a buffer overflow vulnerability (CWE-119) affecting Schneider Electric PowerLogic ION7400, PM8000, and ION9000 power meters running firmware versions prior to V3.0.0. The flaw stems from improper restriction of operations within the bounds of a memory buffer. Attackers can exploit the issue over the network without authentication or user interaction. Successful exploitation forces the meter to reboot or enables remote code execution on the device. These meters are deployed in industrial, commercial, and utility power monitoring environments where availability is critical to operational technology (OT) systems.
Critical Impact
Unauthenticated network attackers can trigger a denial-of-service condition or execute arbitrary code on affected PowerLogic meters, disrupting power monitoring infrastructure.
Affected Products
- Schneider Electric PowerLogic ION7400 (all firmware versions prior to V3.0.0)
- Schneider Electric PowerLogic PM8000 (all firmware versions prior to V3.0.0)
- Schneider Electric PowerLogic ION9000 (all firmware versions prior to V3.0.0)
Discovery Timeline
- 2021-03-11 - CVE-2021-22714 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2021-22714
Vulnerability Analysis
The vulnerability is classified under CWE-119, improper restriction of operations within the bounds of a memory buffer. The affected PowerLogic meters fail to enforce correct boundary checks when processing input received over the network. An attacker can supply malformed or oversized data that writes beyond the allocated buffer in device memory. The resulting memory corruption can crash the meter firmware, forcing an unscheduled reboot. In more severe cases, the corruption can be steered to redirect execution flow, leading to arbitrary code execution on the embedded controller.
Root Cause
The root cause is insufficient validation of input length or content before it is copied into a fixed-size buffer in the meter firmware. Schneider Electric did not publish source-level technical details, but the vendor advisory SEVD-2021-068-02 confirms the memory corruption condition and its impact on availability and code execution.
Attack Vector
The attack is remotely exploitable over the network and requires no authentication or user interaction. An attacker with network access to the meter's management interfaces can send crafted packets that trigger the buffer overflow. Because PowerLogic meters often reside on segmented OT networks reachable from engineering workstations and historian servers, a compromised IT host can pivot to reach exposed meters. See the Schneider Electric Security Advisory for vendor-confirmed details.
No verified public proof-of-concept code is available for this vulnerability. The exploitation mechanism involves sending oversized or malformed network input that overruns an internal buffer in the meter firmware, corrupting adjacent memory structures and potentially overwriting return addresses or function pointers used by the device's execution flow.
Detection Methods for CVE-2021-22714
Indicators of Compromise
- Unexpected reboots or watchdog resets of PowerLogic ION7400, PM8000, or ION9000 meters with no operator-initiated action.
- Loss of meter telemetry or polling timeouts on SCADA, energy management, or historian systems collecting from these devices.
- Anomalous inbound network traffic to meter management ports from hosts outside the engineering or OT zone.
- Firmware integrity mismatches or unexpected firmware version strings reported by the meter after a reboot event.
Detection Strategies
- Monitor OT network flows for unauthenticated sessions targeting PowerLogic meters and alert on protocol anomalies or malformed packets.
- Correlate meter availability events with network logs to identify reboot patterns that align with external probing.
- Deploy passive ICS network monitoring to baseline normal communication and flag deviations such as oversized payloads to meter endpoints.
Monitoring Recommendations
- Aggregate syslog and SNMP traps from PowerLogic meters into a centralized SIEM for correlation with network and identity telemetry.
- Track firmware versions across the meter fleet and alert on devices still running versions prior to V3.0.0.
- Inventory all network paths that can reach meter management interfaces and review for unauthorized exposure.
How to Mitigate CVE-2021-22714
Immediate Actions Required
- Upgrade PowerLogic ION7400, PM8000, and ION9000 firmware to V3.0.0 or later as instructed in SEVD-2021-068-02.
- Restrict network access to meter management interfaces to authorized engineering workstations only.
- Place meters behind ICS-aware firewalls and enforce strict allow-list rules for source addresses and protocols.
- Audit the meter fleet to identify any device still running firmware prior to V3.0.0 and prioritize remediation.
Patch Information
Schneider Electric resolved CVE-2021-22714 in PowerLogic ION7400, PM8000, and ION9000 firmware version V3.0.0. Customers should download the firmware update and follow the upgrade procedure described in the Schneider Electric Security Advisory SEVD-2021-068-02.
Workarounds
- Segment PowerLogic meters onto a dedicated OT VLAN with no direct routing from corporate IT networks.
- Disable unused network services and management protocols on the meters to reduce the exposed attack surface.
- Enforce jump-host access for any administrative connection to meter interfaces and log all sessions.
- Apply ICS firewall rules that drop malformed or oversized packets destined for meter management ports.
# Example firewall allow-list restricting meter access to engineering hosts only
iptables -A FORWARD -s 10.20.30.0/24 -d 10.50.0.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -s 10.20.30.0/24 -d 10.50.0.0/24 -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d 10.50.0.0/24 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
