CVE-2026-19346 Overview
CVE-2026-19346 is a command injection vulnerability in the Tenda CH22 router running firmware version 1.0.0.1. The flaw resides in the formCertListInfo function handling requests to the /goform/CertListInfo endpoint. Attackers can manipulate the Name argument to inject operating system commands that execute in the context of the web management process. The vulnerability is exploitable remotely over the network and public proof-of-concept details have been disclosed. The issue is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component.
Critical Impact
Successful exploitation grants remote command execution on the affected Tenda CH22 device, enabling full compromise of the router and pivoting into connected networks.
Affected Products
- Tenda CH22 router, firmware version 1.0.0.1
- Web management interface endpoint /goform/CertListInfo
- Devices exposing the HTTP management service to untrusted networks
Discovery Timeline
- 2026-08-09 - CVE-2026-19346 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-19346
Vulnerability Analysis
The vulnerability originates in the formCertListInfo handler within the Tenda CH22 web management binary. The handler accepts a Name parameter submitted through HTTP requests to /goform/CertListInfo and passes the value into a system command invocation without proper sanitization. Because the input is concatenated into a shell context, injected metacharacters such as ;, &&, or backticks are interpreted by the underlying shell.
An authenticated attacker with low privileges on the management interface can supply crafted values that break out of the intended command and execute arbitrary binaries. The web service typically runs with elevated privileges on embedded routers, so injected commands often execute as root. Exploitation results in full compromise of confidentiality, integrity, and availability of the device.
Root Cause
The root cause is missing neutralization of shell metacharacters before the Name parameter is embedded into a command string. The formCertListInfo function does not enforce an allow-list on certificate name inputs and does not use safe process-invocation APIs that separate arguments from the command interpreter. This aligns with [CWE-74] injection weaknesses.
Attack Vector
Exploitation requires network reachability to the router's HTTP management interface and low-privileged credentials. An attacker submits an HTTP POST request to /goform/CertListInfo with a Name field containing a shell payload. The injected command runs on the device's Linux operating system, allowing installation of persistent backdoors, credential theft, DNS hijacking, or lateral movement into the LAN.
The vulnerability manifests when the formCertListInfo handler forwards unsanitized user input to a shell. Technical write-up details are available at the Notion advisory and VulDB entry for CVE-2026-19346.
Detection Methods for CVE-2026-19346
Indicators of Compromise
- HTTP POST requests to /goform/CertListInfo containing shell metacharacters (;, |, &, backticks, $()) in the Name field
- Unexpected outbound connections initiated by the router to attacker-controlled hosts shortly after management interface access
- New processes, cron jobs, or startup entries on the router that do not match the vendor firmware baseline
- Configuration changes to DNS servers, firewall rules, or administrative accounts without corresponding admin activity
Detection Strategies
- Deploy network intrusion detection signatures that inspect requests to /goform/CertListInfo for shell metacharacters in the Name parameter
- Monitor router syslog or remote logging streams for administrative logins followed by anomalous command execution
- Baseline expected traffic patterns from the router's management VLAN and alert on deviations
Monitoring Recommendations
- Forward router logs to a centralized logging or SIEM platform for correlation with endpoint and identity telemetry
- Track authentication attempts against the router web interface and alert on brute-force or credential-stuffing patterns
- Inspect north-south traffic for anomalous protocols originating from network infrastructure devices
How to Mitigate CVE-2026-19346
Immediate Actions Required
- Restrict access to the Tenda CH22 web management interface to trusted management VLANs and block WAN-side administration
- Rotate administrative credentials on the device and disable any default or shared accounts
- Audit the router for unauthorized configuration changes, new users, and modified DNS entries
- Isolate affected devices from sensitive network segments until a vendor patch is applied
Patch Information
At the time of publication, no vendor patch has been referenced in the NVD entry for CVE-2026-19346. Consult the Tenda official website for firmware advisories and updates specific to the CH22 platform.
Workarounds
- Place the router behind a segmented management network and require VPN access for administrative sessions
- Apply ACLs on upstream infrastructure to block HTTP and HTTPS access to the router management interface from untrusted sources
- Disable remote management features if they are not required for operations
- Replace end-of-life or unsupported Tenda CH22 devices with vendor-supported hardware if no patch becomes available
# Example iptables rule to restrict management access to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
