# CVE-2025-51390: TOTOLINK N600R command injection in setWiFiWpsConfig

Source: https://junglewise.ai/threats/cve-2025-51390-totolink-n600r-command-injection-in-setwifiwpsconfig  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-08-04. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-51390 · Severity: critical · CVSS 9.8 · Published 2025-08-04

A vulnerability exists in the TOTOLINK N600R wireless router, a device used to provide internet connectivity in homes and small offices. An attacker can remotely take full control of the router by sending a specially crafted request to the Wi-Fi Protected Setup (WPS) configuration settings. This could allow an unauthorized user to intercept network traffic, disrupt internet service, or use the device as a foothold for further attacks on the local network.

Technologies: [TOTOLINK N600r](https://junglewise.ai/threats/technologies/n600r). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2025-51390 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-51390 being exploited in the wild.

**How severe is CVE-2025-51390?** Critical severity, with a CVSS score of 9.8, published 4 August 2025.

**Which products and versions are affected?** TOTOLINK N600r 4.3.0cu.7647_B20210106, 4.3.0cu.7866_B20220506.

**Is there a fix for CVE-2025-51390?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-51390 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-51390?** Check whether you run TOTOLINK N600r or TOTOLINK N600r Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An OS command injection vulnerability exists in the 'cstecgi.cgi' component of TOTOLINK N600R firmware (specifically versions 4.3.0cu.7647_B20210106 and 4.3.0cu.7866_B20220506). The flaw is located in the setWiFiWpsConfig function (offset 0x41caac) where the 'pin' parameter is insufficiently sanitized before being passed to a system shell command. A remote, unauthenticated attacker can exploit this by sending a crafted JSON request to the 'UploadCustomModule/setWiFiWpsConfig' endpoint containing shell metacharacters (e.g., backticks) in the 'pin' field. Successful exploitation results in arbitrary command execution with the privileges of the web server. Additionally, a related stack-based buffer overflow was identified at offset 0x41ca08 due to unsafe use of strncpy.

## Affected products

- TOTOLINK N600R 4.3.0cu.7647_B20210106, 4.3.0cu.7866_B20220506

## Timeline

- 2025-08-04: advisory: Initial NVD publication
- 2025-08-05: other: CISA-ADP enrichment and CVSS scoring added

## References

- [https://github.com/Luanruy/qianxin/blob/main/CVE-2025-51390.md](https://github.com/Luanruy/qianxin/blob/main/CVE-2025-51390.md)
- [https://github.com/Luanruy/qianxin/blob/main/overflow-0x41ca08.md](https://github.com/Luanruy/qianxin/blob/main/overflow-0x41ca08.md)

## Related threats

- [TOTOLINK N600R insufficient randomness in session token generation](https://junglewise.ai/threats/cve-2026-82555-totolink-n600r-insufficient-randomness-in-session-token)
- [TOTOLINK N600R command injection in cstecgi.cgi](https://junglewise.ai/threats/cve-2026-79912-totolink-n600r-command-injection-in-cstecgi-cgi)
- [TOTOLINK N600R stack-based buffer overflow in setSystemConfig](https://junglewise.ai/threats/cve-2026-79911-totolink-n600r-stack-based-buffer-overflow-in-setsystemconfig)