CVE-2026-92397: Ruijie RG-EW3000GX Router RCE Vulnerability

CVE-2026-92397 Overview

CVE-2026-92397 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 cc_set function of the unifyframe-sgi.elf binary within the configChange component. Attackers can manipulate the data.url argument to inject arbitrary OS commands that execute in the context of the router service. The issue is exploitable remotely, and a public exploit is available. The weakness is classified under CWE-77: Improper Neutralization of Special Elements used in a Command.

Critical Impact
Authenticated remote attackers can execute arbitrary operating system commands on affected Ruijie RG-EW3000GX routers, leading to full device compromise and pivoting into internal networks.

Affected Products

Ruijie RG-EW3000GX wireless router
Firmware version EW_3.0(1)B11P380
Component: configChange handler in unifyframe-sgi.elf

Discovery Timeline

2026-09-16 - CVE-2026-92397 published to the National Vulnerability Database
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-92397

Vulnerability Analysis

The vulnerability affects the cc_set function within the unifyframe-sgi.elf binary, a core management component on the Ruijie RG-EW3000GX router. The function processes configuration change requests submitted through the configChange interface. When the handler parses the data.url parameter, it passes attacker-controlled input to an underlying OS command interpreter without sufficient sanitization or neutralization of shell metacharacters. Successful exploitation results in arbitrary command execution with the privileges of the management process, typically elevated on embedded router firmware.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-77]. The cc_set function constructs a shell command string that incorporates the data.url field directly from the request body. Because the input is not validated against an allowlist and shell metacharacters such as ;, |, &, and backticks are not escaped, injected payloads break out of the intended command context and execute additional commands.

Attack Vector

Exploitation requires network reachability to the router's management interface and authenticated access, as reflected in the CVSS vector requiring high privileges. An attacker sends a crafted request to the configChange endpoint with a malicious data.url value containing shell metacharacters and an appended command. The attack does not require user interaction. Public disclosure of technical details on the GitHub firmware analysis repository increases the likelihood that opportunistic actors will weaponize the flaw against exposed devices.

For a complete technical breakdown of the vulnerable function and request format, refer to the VulDB entry for CVE-2026-92397.

Detection Methods for CVE-2026-92397

Indicators of Compromise

HTTP requests to the router management interface targeting the configChange handler with shell metacharacters (;, |, &, backticks, $()) in the data.url parameter.
Unexpected child processes spawned by unifyframe-sgi.elf, such as sh, wget, curl, nc, or busybox.
Outbound connections from the router to unknown hosts, especially on non-standard ports commonly used for reverse shells.

Detection Strategies

Inspect HTTP request logs on the router or upstream network security devices for POST bodies referencing data.url combined with command separators.
Deploy network intrusion detection signatures that match command injection patterns targeting Ruijie management endpoints.
Baseline the expected process tree of the router firmware and alert on deviations, particularly shell invocations from web management binaries.

Monitoring Recommendations

Forward router syslog and web management access logs to a centralized logging platform for correlation and long-term retention.
Monitor egress traffic from network infrastructure devices for anomalies such as unexpected DNS queries, C2 beacons, or file downloads.
Track configuration changes on the RG-EW3000GX and alert on modifications made outside of authorized change windows.

How to Mitigate CVE-2026-92397

Immediate Actions Required

Restrict administrative access to the router management interface to trusted management networks only, blocking exposure from the internet or untrusted VLANs.
Rotate administrative credentials on affected RG-EW3000GX devices and enforce strong, unique passwords.
Audit device logs and configuration for evidence of unauthorized command execution or configuration changes.

Patch Information

At the time of publication, no vendor advisory or firmware update from Ruijie has been referenced in the CVE record. Administrators should monitor Ruijie's official support channels for a firmware release addressing CVE-2026-92397 in versions after EW_3.0(1)B11P380. Additional technical context is available on the VulDB vulnerability page.

Workarounds

Disable remote administration on the WAN interface and require access only through a trusted internal management segment or VPN.
Place the router management plane behind a firewall that filters requests to the configChange endpoint from unauthorized sources.
Where feasible, replace or isolate affected RG-EW3000GX devices until a vendor patch is validated and deployed.

bash

# Example: restrict router management access to a trusted subnet
# (Apply on an upstream firewall in front of the RG-EW3000GX)
iptables -A FORWARD -p tcp --dport 80  -s 10.10.0.0/24 -d <router_ip> -j ACCEPT
iptables -A FORWARD -p tcp --dport 443 -s 10.10.0.0/24 -d <router_ip> -j ACCEPT
iptables -A FORWARD -p tcp --dport 80  -d <router_ip> -j DROP
iptables -A FORWARD -p tcp --dport 443 -d <router_ip> -j DROP