CVE-2026-38710 Overview
CVE-2026-38710 is a command injection vulnerability [CWE-77] affecting Cudy TR1200 v2.4.15 and TR3000 v2.4.21 routers. The flaw resides in the system.setclock interface, which fails to sanitize user-supplied input before passing it to the underlying operating system. Authenticated attackers can inject arbitrary shell commands that execute with root privileges. Successful exploitation grants full control over the affected device, including network traffic interception, persistent implant installation, and lateral movement within the connected network.
Critical Impact
Authenticated attackers can execute arbitrary commands as root on Cudy TR1200 and TR3000 routers through the system.setclock interface, resulting in complete device compromise.
Affected Products
- Cudy TR1200 firmware v2.4.15
- Cudy TR3000 firmware v2.4.21
- system.setclock management interface
Discovery Timeline
- 2026-07-31 - CVE-2026-38710 published to NVD
- 2026-08-03 - Last updated in NVD database
Technical Details for CVE-2026-38710
Vulnerability Analysis
The vulnerability exists within the system.setclock interface exposed by the router's management stack. This interface accepts parameters used to configure the device system clock. The affected handler concatenates attacker-controlled input into a shell command string without validation or escaping. When the command is executed, injected metacharacters such as ;, |, or backticks break out of the intended command context. The router process runs as root, so injected commands inherit root privileges. Exploitation yields arbitrary command execution on the underlying Linux system, enabling firmware modification, credential theft, and covert traffic manipulation.
Root Cause
The root cause is improper neutralization of special elements used in an OS command [CWE-77]. The system.setclock handler treats user input as trusted shell fragments rather than parameter values. No allowlist, escaping routine, or safe API such as execve with argument arrays is applied before invocation.
Attack Vector
Exploitation requires network access to the router management interface and valid high-privilege credentials. An attacker sends a crafted request to the system.setclock endpoint containing shell metacharacters embedded in the clock configuration payload. The injected command executes as root on the device. See the Cudy Security Advisory SA-26-7 for vendor technical details.
Detection Methods for CVE-2026-38710
Indicators of Compromise
- Unexpected outbound connections originating from the router management plane to attacker-controlled infrastructure.
- Modified system files, cron entries, or startup scripts on the router filesystem.
- Anomalous processes spawned as children of the web management daemon handling system.setclock.
- Log entries referencing system.setclock requests containing shell metacharacters such as ;, &&, |, or backticks.
Detection Strategies
- Inspect HTTP or RPC request bodies to the router management interface for shell metacharacters within clock configuration parameters.
- Alert on newly spawned shell processes or utilities such as wget, curl, nc, or busybox originating from the management daemon.
- Correlate administrative authentication events with subsequent setclock requests that deviate from normal clock synchronization patterns.
Monitoring Recommendations
- Forward router syslog data to a centralized log platform and retain administrative interface activity for review.
- Baseline expected system.setclock traffic patterns and alert on request bodies exceeding typical length or format.
- Monitor authentication logs for administrative logins from unexpected source addresses that precede configuration changes.
How to Mitigate CVE-2026-38710
Immediate Actions Required
- Restrict access to the router management interface to trusted management VLANs or jump hosts only.
- Rotate administrative credentials on all TR1200 and TR3000 devices and enforce strong, unique passwords.
- Disable remote administration over WAN interfaces until a patched firmware release is applied.
- Review router filesystems and running processes for signs of prior exploitation before applying updates.
Patch Information
Refer to the Cudy Security Advisory SA-26-7 for firmware update availability and version guidance. Apply the vendor-supplied firmware update to TR1200 v2.4.15 and TR3000 v2.4.21 devices as soon as a fixed version is published.
Workarounds
- Place affected routers behind a network segmentation boundary that blocks untrusted access to management ports.
- Enforce administrative access through a VPN with multi-factor authentication rather than direct exposure.
- Audit and remove unused administrative accounts to reduce the credential attack surface required for exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
