CVE-2026-92398 Overview
CVE-2026-92398 is an operating system command injection vulnerability in the Ruijie RG-EW3000GX wireless router running firmware version EW_3.0(1)B11P380. The flaw resides in the user_list_note module and affects unknown functionality of the /etc/rg_config/admin file. Attackers can manipulate the Name argument to inject arbitrary operating system commands. The vulnerability is exploitable remotely across the network, and a public exploit has been released, increasing the risk of opportunistic attacks against exposed devices [CWE-77].
Critical Impact
Successful exploitation grants attackers arbitrary command execution on the affected router, enabling full device compromise, traffic interception, and lateral movement into the internal network.
Affected Products
- Ruijie RG-EW3000GX wireless router
- Firmware version EW_3.0(1)B11P380
- user_list_note module handling /etc/rg_config/admin
Discovery Timeline
- 2026-09-16 - CVE-2026-92398 published to the National Vulnerability Database (NVD)
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-92398
Vulnerability Analysis
The vulnerability exists within the user_list_note module of the Ruijie RG-EW3000GX router's management interface. The affected code path processes user-supplied input associated with the Name parameter tied to the /etc/rg_config/admin configuration file. Because the input is passed to an operating system shell without adequate sanitization or neutralization of shell metacharacters, attackers can append additional commands that the underlying operating system executes with the privileges of the calling service.
An authenticated attacker with high privileges can trigger the injection remotely across the network without user interaction. Public exploit details are available through the referenced VulDB entry and a technical writeup on GitHub.
Root Cause
The root cause is improper neutralization of special elements used in an operating system command [CWE-77]. The Name field is concatenated into a shell command string that is executed by the router firmware. Shell metacharacters such as ;, |, &, and backticks are not filtered before command construction, allowing attacker-supplied commands to be appended to the intended operation.
Attack Vector
Exploitation occurs over the network against the router's administrative interface. The attacker submits a crafted request that stores a malicious payload in the Name argument processed by the user_list_note handler. When the affected code writes to or processes /etc/rg_config/admin, the injected shell commands execute on the router. Successful exploitation can be used to establish persistent access, modify firewall rules, pivot to internal hosts, and intercept or manipulate LAN and WAN traffic.
No verified proof-of-concept code is reproduced here. Refer to the public advisory for technical exploitation details.
Detection Methods for CVE-2026-92398
Indicators of Compromise
- Unexpected modifications to /etc/rg_config/admin or adjacent configuration files on the router
- Outbound connections from the router to unknown hosts on non-standard ports
- New or altered administrative user entries containing shell metacharacters (;, |, &, `) in the Name field
- Unrecognized processes or scheduled tasks spawned by the router's management daemon
Detection Strategies
- Inspect HTTP or HTTPS requests to the router management interface for payloads containing shell metacharacters in parameters bound to the user_list_note module
- Enable and review router syslog output for anomalous command execution or configuration write events
- Baseline expected administrative traffic to the RG-EW3000GX and alert on deviations, including administrative sessions from unusual source addresses
Monitoring Recommendations
- Forward router logs to a centralized log platform and alert on writes to /etc/rg_config/admin outside of change windows
- Monitor network egress from the router itself for reverse shells, DNS tunneling, or connections to threat intelligence-flagged infrastructure
- Track failed and successful administrative authentication attempts to detect credential stuffing that could precede exploitation
How to Mitigate CVE-2026-92398
Immediate Actions Required
- Restrict access to the router administrative interface to trusted management VLANs and jump hosts, blocking exposure to the internet
- Rotate all administrative credentials on affected RG-EW3000GX devices and enforce strong, unique passwords
- Audit /etc/rg_config/admin and other configuration files for tampering, and reset the device to factory defaults if compromise is suspected
- Monitor the Ruijie security advisory portal for a firmware update addressing CVE-2026-92398
Patch Information
At the time of publication, no vendor patch has been referenced in the NVD entry for firmware EW_3.0(1)B11P380. Administrators should track the VulDB entry for CVE-2026-92398 and Ruijie vendor channels for a firmware release, and apply it immediately once available.
Workarounds
- Disable remote management on the WAN interface and permit administrative access only from a management network
- Place the router behind a network access control list that limits inbound connections to its management ports
- Require VPN authentication before any administrator can reach the router's web interface
- Segment the router from sensitive internal assets to contain the blast radius of a successful compromise
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.