IXON VPN Client
CISA warns CVE-2026-75925 (CVSS 9.6) in IXON VPN Client <1.4.7 lets attackers inject config directives for root/SYSTEM remote code execution.
IXON's CRLF injection flaw (CVE-2026-75925, CWE-93) in VPN Client before 1.4.7 lets the unauthenticated local configuration service inject additional directives into a file consumed by a privileged subprocess. Injected configuration persists across client and OS restarts, enabling code execution as root or SYSTEM while the VPN connection keeps functioning normally. Deployments span energy, manufacturing, water, and IT sectors; no public exploitation has been reported to CISA.
- Unauthenticated local service accepts changes later executed by a privileged subprocess
- Injected configuration persists across restarts with no visible behavioral change
- Fix: upgrade to IXON VPN Client 1.4.7 or later
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-75925 | CRLF Injection in IXON VPN Client Enables Root/SYSTEM Command Execution CVE-2026-75925 is a CRLF injection flaw (CWE-93) in the IXON VPN Client prior to version 1.4.7, where configuration values accepted by the local service are written to a file that is later consumed by a privileged subprocess without line-ending sequences being neutralized. Because the configuration interface accepts changes without authenticating or verifying the requester, a remote attacker (with some user interaction per the CVSS vector) can submit crafted configuration values that inject additional directives into the privileged file. This allows the attacker to execute commands with root (Linux) or SYSTEM (Windows) privileges on the machine running the client. The injected configuration persists silently across restarts of the client and the operating system, and the VPN continues to work normally, so victims see no visible change. No public proof-of-concept, KEV listing, or reported in-the-wild exploitation is known; EPSS currently estimates a 0.7% chance of exploitation within 30 days. Do: Upgrade IXON VPN Client to version 1.4.7 or later on all Windows and Linux hosts. Because injected configuration values persist silently on disk, after patching inspect the client's configuration file for unexpected extra directives and rewrite it with known-good values. Until patched, limit exposure of the local configuration interface (e.g., avoid untrusted browsing on privileged support workstations) and monitor for the vendor's advisory and any published proof-of-concept. | 9.4 | <1% |
| nichelikely on the order of tens of thousands of installations worldwide (industrial remote-access niche vendor; no public install counts in the provided data) |
Full article581 words · extracted from cisa.gov · click to collapse
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
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.
Affected Products
IXON VPN Client
Vendor:
IXON
Product Version:
IXON VPN Client: <1.4.7
Product Status:
known_affected
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
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-02