CVE-2025-5504 Overview
CVE-2025-5504 is a command injection vulnerability in the TOTOLINK X2000R router running firmware version 1.0.0-B20230726.1108. The flaw resides in the /boafrm/formWsc endpoint, where the peerRptPin parameter is passed to an underlying system command without proper sanitization [CWE-74]. An authenticated remote attacker can inject shell metacharacters to execute arbitrary commands on the device. A public proof-of-concept has been disclosed, and the vendor did not respond to disclosure attempts.
Critical Impact
Successful exploitation allows remote command execution on the router with the privileges of the web server process, enabling persistent device compromise and pivoting into the internal network.
Affected Products
- TOTOLINK X2000R router hardware
- TOTOLINK X2000R firmware version 1.0.0-B20230726.1108
- Deployments exposing the router administrative interface to untrusted networks
Discovery Timeline
- 2025-06-03 - CVE-2025-5504 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-5504
Vulnerability Analysis
The vulnerability affects the formWsc handler served by the boa web server on the TOTOLINK X2000R. This handler processes Wi-Fi Protected Setup (WPS) requests submitted through the router's web management interface. The peerRptPin HTTP parameter is consumed by the handler and passed to a system-level command execution routine without validation or escaping of shell metacharacters.
Because the router's web daemon typically runs with elevated privileges on embedded Linux, injected commands execute in that context. This provides an attacker with direct control over the device operating system. Exploitation requires network reachability to the management interface and low-privilege credentials, according to the CVSS vector.
Root Cause
The root cause is improper neutralization of special elements used in a downstream component [CWE-74]. User-controlled input from the peerRptPin argument reaches a shell invocation, allowing metacharacters such as ;, |, and backticks to break out of the intended command context and execute arbitrary binaries available on the router.
Attack Vector
An attacker sends a crafted HTTP POST request to /boafrm/formWsc containing a malicious peerRptPin value. When the router processes the request, appended shell commands execute on the underlying system. If the management interface is exposed to the internet, or an attacker has gained access to the LAN, the attack can be conducted remotely without user interaction.
No verified proof-of-concept code is reproduced here. Technical details are available in the GitHub PoC Repository and the VulDB Analysis #310918.
Detection Methods for CVE-2025-5504
Indicators of Compromise
- HTTP POST requests to /boafrm/formWsc containing shell metacharacters (;, &&, |, backticks, $()) inside the peerRptPin parameter.
- Unexpected outbound connections from the router IP address to attacker-controlled hosts following administrative requests.
- Modified firmware components, new cron entries, or unfamiliar processes on the device consistent with post-exploitation persistence.
Detection Strategies
- Deploy network intrusion detection signatures matching command-injection patterns in requests targeting /boafrm/formWsc.
- Inspect web-server access logs on the router (if exportable via syslog) for anomalous peerRptPin values exceeding expected length or containing non-alphanumeric characters.
- Correlate router administrative activity with subsequent lateral movement or credential-access events observed on endpoints behind the device.
Monitoring Recommendations
- Forward router syslog and NetFlow data into a centralized SIEM for long-term retention and behavioral baselining.
- Alert on any successful HTTP authentication to the router management interface from external or unexpected internal source addresses.
- Track EPSS trending for CVE-2025-5504 (currently 12.9%, 96th percentile) to prioritize response as exploitation likelihood evolves.
How to Mitigate CVE-2025-5504
Immediate Actions Required
- Restrict access to the router's web management interface to trusted management VLANs and block WAN-side exposure.
- Disable WPS functionality on the router where operationally feasible, reducing exposure of the vulnerable formWsc handler.
- Rotate administrative credentials on the affected devices to limit reuse by attackers who may have observed traffic.
Patch Information
No vendor patch is available. TOTOLINK was contacted regarding this disclosure but did not respond, according to the CVE record. Organizations should treat affected units as end-of-support for this vulnerability and plan replacement or compensating controls. Monitor the TOTOLINK Official Website for future firmware updates addressing the peerRptPin parameter handling in /boafrm/formWsc.
Workarounds
- Place affected X2000R devices behind an upstream firewall that filters HTTP requests to /boafrm/formWsc from untrusted networks.
- Migrate to a supported router platform if the vendor does not release a fix within an acceptable timeframe.
- Segment IoT and network infrastructure devices from user endpoints and sensitive assets to limit blast radius if the router is compromised.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.