Original Article Summary

View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to perform remote code execution on the computer running the client with elevated privileges. The following versions of IXON VPN Client are affected: VPN Client <1.4.7 (CVE-2026-75925) CVSS Vendor Equipment Vulnerabilities v3 9.6 IXON IXON VPN Client Improper Neutralization of CRLF Sequences ('CRLF Injection') Background Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, Energy, Information Technology, Water and Wastewater Countries/Areas Deployed: Worldwide Company Headquarters Location: Netherlands Vulnerabilities Expand All + CVE-2026-75925 Improper Neutralization of CRLF Sequences (CWE-93) in IXON VPN Client before version 1.4.7 allows an attacker to execute commands as root or SYSTEM. Configuration values accepted by the local service are written to a file later consumed by a privileged subprocess, without line-ending sequences being neutralised, which allows additional directives to be introduced into that file. The configuration interface accepts changes without authenticating or verifying the origin of the requester (CWE-306, contributing). The injected configuration persists on disk across restarts of the client and the operating system, and the VPN connection continues to function normally, so there is no behavioral change visible to the user. View CVE Details Affected Products IXON VPN Client Vendor: IXON Product Version: IXON VPN Client: <1.4.7 Product Status: known_affected Remediations Mitigation IXON recommends updating the IXON VPN client to version 1.4.7 or later on every computer where it is installed. Mitigation As of August 5, 2026, IXON cloud rejects connections from clients below v1.4.7 at both the portal and the back-end API. Since the privileged subprocess and injected listener are only created when the client connects, unpatched installations cannot complete the exploit chain. Mitigation If the client is no longer needed, IXON recommends uninstalling the VPN client from the computer. Mitigation For more information please refer to the IXON Trust Center Advisory at https://www.ixon.cloud/Advisories/ADV-2026-08-05.pdf. https://www.ixon.cloud/Advisories/ADV-2026-08-05.pdf Relevant CWE: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.6 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H 4.0 9.4 CRITICAL CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Acknowledgments Luuk van Rheden of IXON discovered this vulnerability. Stan van Duijnhoven of IXON reported this vulnerability to CISA. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-08-05 Date Revision Summary 2026-08-05 1 Initial Publication 2026-09-03 2 Initial Republication by CISA Legal Notice and Terms of Use