CVE-2025-62765 Overview
CVE-2025-62765 affects the General Industrial Controls Lynx+ Gateway, an operational technology (OT) device deployed in industrial control system (ICS) environments. The vulnerability stems from cleartext transmission of sensitive information [CWE-319]. An attacker positioned on the network can passively observe traffic between the gateway and clients to capture sensitive data, including plaintext credentials. CISA tracks this issue under ICS Advisory ICSA-25-317-08.
Critical Impact
Network-adjacent attackers can intercept administrative credentials transmitted in cleartext, enabling unauthorized access to the Lynx+ Gateway and downstream industrial control systems.
Affected Products
- General Industrial Controls Lynx+ Gateway
- ICS/OT environments using the Lynx+ Gateway for protocol translation
- Networks where Lynx+ Gateway management traffic is reachable by untrusted hosts
Discovery Timeline
- 2025-11-15 - CVE-2025-62765 published to NVD and disclosed via CISA ICS Advisory ICSA-25-317-08
- 2026-04-15 - Last updated in the NVD database
Technical Details for CVE-2025-62765
Vulnerability Analysis
The Lynx+ Gateway transmits sensitive information, including authentication credentials, over the network without encryption. Any attacker with the ability to observe network packets between a client and the gateway can recover this data using passive traffic capture tools. Because credentials traverse the wire in cleartext, attackers do not need to break cryptographic protections or interact with the gateway to obtain them.
The weakness is categorized under CWE-319: Cleartext Transmission of Sensitive Information. The CISA advisory and the corresponding GitHub CSAF data file document the issue as exploitable remotely with low attack complexity.
Root Cause
The gateway's management or communication protocol does not enforce transport layer encryption. Credential material and other sensitive payloads are serialized directly into network packets without TLS, SSH, or another encrypted channel. The design omits confidentiality controls that are standard for authenticated services.
Attack Vector
The attack is network-based and requires no authentication or user interaction. An adversary needs only the ability to sniff traffic on a segment shared with the gateway or its clients. Typical sniffing positions include compromised switches, span ports, ARP poisoning on flat OT networks, or rogue devices on shared VLANs. Captured credentials can then be replayed against the gateway to gain administrative control over the device and any connected ICS endpoints.
Detection Methods for CVE-2025-62765
Indicators of Compromise
- Unexpected ARP table changes or duplicate MAC entries on OT VLANs that host the Lynx+ Gateway
- Unauthorized port mirroring, SPAN sessions, or promiscuous-mode interfaces on switches adjacent to the gateway
- Successful logins to the Lynx+ Gateway from hosts outside documented engineering workstations
- Unrecognized devices performing repeated TCP connections to Lynx+ Gateway management ports
Detection Strategies
- Inspect packet captures of Lynx+ Gateway traffic for cleartext credential strings in HTTP, Telnet, FTP, or proprietary management protocols
- Alert on management sessions originating from IP addresses not on an approved allowlist
- Use network intrusion detection signatures to flag plaintext authentication patterns on OT segments
- Correlate authentication events with source host identity to detect credential reuse from unexpected endpoints
Monitoring Recommendations
- Forward switch logs, NetFlow, and OT network sensor telemetry into a centralized analytics platform such as Singularity Data Lake for OCSF-normalized analysis and retention
- Continuously monitor for new MAC/IP pairings on segments containing the Lynx+ Gateway
- Establish a baseline of expected management connections and alert on deviations
How to Mitigate CVE-2025-62765
Immediate Actions Required
- Restrict access to the Lynx+ Gateway to a dedicated management VLAN reachable only by authorized engineering workstations
- Rotate all credentials used with the Lynx+ Gateway and avoid reusing them on other systems
- Place the gateway behind a firewall and block all internet-exposed management interfaces
- Review historical packet captures and logs for signs of prior credential interception
Patch Information
No vendor patch information is included in the published advisory data for CVE-2025-62765. Refer to the CISA ICS Advisory ICSA-25-317-08 and contact General Industrial Controls for current firmware availability and remediation guidance.
Workarounds
- Tunnel all gateway management traffic through an encrypted channel such as an IPsec or TLS VPN terminated at a jump host
- Enforce network segmentation per ISA/IEC 62443 zones and conduits to isolate the gateway from corporate and untrusted networks
- Disable any unused management protocols on the gateway and limit administrative access to a single, monitored interface
- Deploy 802.1X or MAC-based port security on switches to prevent rogue devices from joining OT segments
# Configuration example: restrict Lynx+ Gateway management access with iptables on an upstream jump host
iptables -A FORWARD -s 10.10.50.0/24 -d 10.20.0.10 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 10.20.0.10 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
