# CVE-2026-9458: Totolink A8000RU OS command injection in setWanCfg

Source: https://junglewise.ai/threats/cve-2026-9458-totolink-a8000ru-os-command-injection-in-setwancfg  
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-2026-9458 · 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 manage local networks. 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.

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

## Quick answers

**Is CVE-2026-9458 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9458 being exploited in the wild.

**How severe is CVE-2026-9458?** 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-2026-9458?** 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-2026-9458 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9458?** 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 'setWanCfg' function of the '/cgi-bin/cstecgi.cgi' component. The vulnerability is rooted in the improper sanitization of the 'enabled' parameter, which is passed from the web interface to the 'Uci_Set_Str_By_Idx' function and eventually executed via 'execv()' through the 'CsteSystem' function. A remote, unauthenticated attacker can exploit this by sending a crafted JSON POST request containing shell metacharacters (e.g., backticks) in the 'enabled' field. Successful exploitation allows for arbitrary command execution with the privileges of the web server. A public proof-of-concept (PoC) is available.

## Affected products

- Totolink A8000RU 7.1cu.643_b20200521

## Timeline

- 2026-05-25: disclosed: Vulnerability disclosed via VulDB and NVD
- 2026-05-25: advisory

## References

- [https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_346/README.md](https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_346/README.md)
- [https://vuldb.com/submit/813457](https://vuldb.com/submit/813457)
- [https://vuldb.com/vuln/365439](https://vuldb.com/vuln/365439)
- [https://vuldb.com/vuln/365439/cti](https://vuldb.com/vuln/365439/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 command injection in UploadFirmwareFile](https://junglewise.ai/threats/cve-2026-9457-totolink-a8000ru-command-injection-in-uploadfirmwarefile)