# CVE-2026-9475: Totolink A8000RU command injection in setIpQosRules

Source: https://junglewise.ai/threats/cve-2026-9475-totolink-a8000ru-command-injection-in-setipqosrules  
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-2026-9475 · Severity: critical · CVSS 9.8 · Published 2026-05-25

A vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and network management for homes and small offices. An attacker can exploit this flaw to take complete control of the router by executing unauthorized system commands. This could lead to the interception of network traffic, theft of sensitive data, or a total disruption of internet services.

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

## Quick answers

**Is CVE-2026-9475 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9475 being exploited in the wild.

**How severe is CVE-2026-9475?** 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-2026-9475?** 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-2026-9475 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-9475?** 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 'setIpQosRules' function within the '/cgi-bin/cstecgi.cgi' component of Totolink A8000RU firmware version 7.1cu.643_b20200521. The root cause is improper neutralization of the 'Comment' argument, which is passed to the 'Uci_Set_Str' function and subsequently executed via 'execv()' through the 'CsteSystem' function. A remote, unauthenticated attacker can exploit this by sending a specially crafted POST request containing shell metacharacters (e.g., backticks) in the JSON payload. Successful exploitation grants the attacker full system-level command execution on the device. Public exploit code (PoC) is available.

## Affected products

- Totolink A8000RU 7.1cu.643_b20200521

## Timeline

- 2026-05-25: disclosed: Public disclosure of the vulnerability and PoC.
- 2026-05-25: advisory: CVE-2026-9475 published.

## References

- [https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_347/README.md](https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_347/README.md)
- [https://vuldb.com/submit/813458](https://vuldb.com/submit/813458)
- [https://vuldb.com/vuln/365456](https://vuldb.com/vuln/365456)
- [https://vuldb.com/vuln/365456/cti](https://vuldb.com/vuln/365456/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 OS command injection in setWanCfg](https://junglewise.ai/threats/cve-2026-9458-totolink-a8000ru-os-command-injection-in-setwancfg)
- [Totolink A8000RU command injection in UploadFirmwareFile](https://junglewise.ai/threats/cve-2026-9457-totolink-a8000ru-command-injection-in-uploadfirmwarefile)