CVE-2026-14193 Overview
CVE-2026-14193 affects the Delta Electronics DVP80ES300T programmable logic controller (PLC). The flaw stems from improper validation of an array index [CWE-129] in the device firmware. A remote attacker can send crafted network traffic to trigger out-of-bounds behavior that halts device operation.
The vulnerability requires no authentication and no user interaction. Successful exploitation results in loss of availability on the affected controller. Confidentiality and integrity are not affected, but industrial control processes relying on the PLC can be interrupted.
Critical Impact
Remote, unauthenticated attackers can cause a denial-of-service condition on the DVP80ES300T PLC by supplying an unchecked array index over the network.
Affected Products
- Delta Electronics DVP80ES300T PLC
- Refer to the Delta security advisory for confirmed firmware ranges
- Deployments exposing the PLC to untrusted networks are at highest risk
Discovery Timeline
- 2026-07-01 - CVE CVE-2026-14193 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-14193
Vulnerability Analysis
The DVP80ES300T firmware processes network-supplied index values without validating them against the bounds of a target array. When the index falls outside expected limits, the firmware reads or writes memory outside the array structure. This triggers an unhandled condition that terminates the affected process or halts the controller.
The attack vector is network-based and requires no privileges or interaction. Impact is limited to availability, consistent with a denial-of-service outcome on the PLC. In operational technology (OT) environments, loss of PLC availability can stop physical processes and require manual intervention to restore operations.
Root Cause
The root cause is missing bounds validation on an attacker-controlled array index, categorized as Improper Validation of Array Index [CWE-129]. Input validation logic fails to compare the supplied index against the allocated array length before use. This allows memory access outside the intended range.
Attack Vector
An attacker with network reachability to the PLC sends a crafted protocol message containing an out-of-bounds index value. The firmware dereferences memory using that index without a bounds check. Processing the malformed request causes a fault that renders the controller unavailable until it is restarted. No verified public exploit code or proof-of-concept is currently available. See the Delta Advisory CVE-2026-14193 for protocol-level details.
Detection Methods for CVE-2026-14193
Indicators of Compromise
- Unexpected reboots, watchdog resets, or STOP-mode transitions on the DVP80ES300T
- Loss of communication with the PLC from HMI or SCADA systems following inbound traffic from unusual sources
- Malformed or oversized protocol frames directed at the PLC's management port
Detection Strategies
- Monitor industrial protocol traffic to the PLC for out-of-range index or length fields
- Alert on repeated PLC connection resets or session failures originating from a single host
- Correlate PLC availability events with network flow records to identify pre-crash traffic patterns
Monitoring Recommendations
- Deploy an OT-aware intrusion detection system (IDS) capable of parsing Delta protocol traffic
- Baseline normal PLC communication partners and alert on new or external sources
- Forward PLC diagnostic logs and network telemetry to a centralized SIEM for correlation
How to Mitigate CVE-2026-14193
Immediate Actions Required
- Restrict network access to the DVP80ES300T so that only authorized engineering workstations and controllers can reach it
- Place the PLC behind an OT firewall and enforce strict allowlists for source addresses and protocols
- Review the Delta Advisory CVE-2026-14193 and apply vendor-supplied firmware when available
Patch Information
Delta Electronics has published advisory Delta-PCSA-2026-00013 describing the issue. Refer to the vendor advisory for the fixed firmware version and installation procedure. Schedule firmware updates during a maintenance window and validate PLC logic after the update.
Workarounds
- Segment the control network from IT and internet-facing systems using a demilitarized zone (DMZ)
- Disable or block unused services and ports on the PLC where the platform permits
- Require VPN or jump-host access for any remote engineering session that must reach the PLC
# Configuration example: restrict inbound traffic to the PLC at an upstream firewall
# Replace addresses with values appropriate to your environment
iptables -A FORWARD -p tcp -d 10.10.20.50 --dport 502 -s 10.10.10.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d 10.10.20.50 --dport 502 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
