# CVE-2026-9432: Totolink A8000RU command injection in setWiFiAdvancedCfg

Source: https://junglewise.ai/threats/cve-2026-9432-totolink-a8000ru-command-injection-in-setwifiadvancedcfg  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-25. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9432 · Severity: critical · CVSS 9.8 · Published 2026-05-25

A security vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and Wi-Fi. An attacker can remotely take full control of the router by sending a specially crafted request to its web management interface. This could lead to the theft of sensitive data, interception of network traffic, or a complete shutdown of the internet service for connected users.

Technologies: [TOTOLINK A8000RU](https://junglewise.ai/threats/technologies/a8000ru). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-9432 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9432 being exploited in the wild.

**How severe is CVE-2026-9432?** Critical severity, with a CVSS score of 9.8, published 25 May 2026.

**Which products and versions are affected?** TOTOLINK A8000RU 7.1cu.643_b20200521.

**Is there a fix for CVE-2026-9432?** 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-2026-9432 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-9432?** Check whether you run TOTOLINK A8000RU 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 Totolink A8000RU router (firmware version 7.1cu.643_b20200521) within the /cgi-bin/cstecgi.cgi component. The flaw is located in the setWiFiAdvancedCfg function, where the 'bgProtection' argument is improperly neutralized before being passed to the CsteSystem function and subsequently executed via execv(). A remote, unauthenticated attacker can exploit this by sending a crafted HTTP POST request containing shell metacharacters (e.g., backticks) in the JSON payload. Successful exploitation allows for arbitrary command execution with the privileges of the web server. Public exploit code (PoC) has been released.

## Affected products

- Totolink A8000RU 7.1cu.643_b20200521

## Timeline

- 2026-05-25: advisory: NVD publication date
- 2026-05-25: disclosed: Public exploit released via GitHub

## References

- [https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_353/README.md](https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_353/README.md)
- [https://vuldb.com/submit/813905](https://vuldb.com/submit/813905)
- [https://vuldb.com/vuln/365413](https://vuldb.com/vuln/365413)
- [https://vuldb.com/vuln/365413/cti](https://vuldb.com/vuln/365413/cti)
- [https://www.totolink.net/](https://www.totolink.net/)

## Related threats

- [Totolink A8000RU OS command injection in setParentalRules](https://junglewise.ai/threats/cve-2026-9478-totolink-a8000ru-os-command-injection-in-setparentalrules)
- [Totolink A8000RU command injection in setAccessDeviceCfg](https://junglewise.ai/threats/cve-2026-9477-totolink-a8000ru-command-injection-in-setaccessdevicecfg)
- [Totolink A8000RU command injection in setPasswordCfg](https://junglewise.ai/threats/cve-2026-9476-totolink-a8000ru-command-injection-in-setpasswordcfg)
- [Totolink A8000RU command injection in setIpQosRules](https://junglewise.ai/threats/cve-2026-9475-totolink-a8000ru-command-injection-in-setipqosrules)
- [Totolink A8000RU OS command injection in setWanCfg](https://junglewise.ai/threats/cve-2026-9458-totolink-a8000ru-os-command-injection-in-setwancfg)