# CVE-2026-5690: Totolink A7100RU OS command injection in setRemoteCfg

Source: https://junglewise.ai/threats/cve-2026-5690-totolink-a7100ru-os-command-injection-in-setremotecfg  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-06. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-5690 · Severity: high · CVSS 7.3 · Published 2026-04-06

A security vulnerability has been identified in the Totolink A7100RU home router. This flaw allows an attacker to remotely execute unauthorized commands on the device by sending a specially crafted web request. If exploited, an attacker could gain full control over the router, potentially leading to the interception of internet traffic, unauthorized access to the local network, or disruption of internet services.

Technologies: [TOTOLINK A7100ru](https://junglewise.ai/threats/technologies/a7100ru). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-5690 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5690 being exploited in the wild.

**How severe is CVE-2026-5690?** High severity, with a CVSS score of 7.3, published 6 April 2026.

**Which products and versions are affected?** TOTOLINK A7100ru 7.4cu.2313_b20191024.

**Is there a fix for CVE-2026-5690?** 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-2026-5690 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-5690?** Check whether you run TOTOLINK A7100ru 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 A7100RU router, specifically within the 'setRemoteCfg' function of the /cgi-bin/cstecgi.cgi component. The vulnerability stems from the improper neutralization of the 'enable' argument, which is passed to the Uci_Set_Str function and eventually executed via execv() in the CsteSystem function. A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) in the 'enable' parameter. Successful exploitation allows for arbitrary command execution with the privileges of the web server. A public Proof of Concept (PoC) using wget has been disclosed.

## Affected products

- Totolink A7100RU 7.4cu.2313_b20191024

## Timeline

- 2026-04-06: disclosed
- 2026-04-06: advisory

## References

- [https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_188/README.md](https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_188/README.md)
- [https://vuldb.com/submit/792947](https://vuldb.com/submit/792947)
- [https://vuldb.com/vuln/355517](https://vuldb.com/vuln/355517)
- [https://vuldb.com/vuln/355517/cti](https://vuldb.com/vuln/355517/cti)
- [https://www.totolink.net/](https://www.totolink.net/)

## Related threats

- [Totolink A7100RU command injection in setGameSpeedCfg](https://junglewise.ai/threats/cve-2026-5692-totolink-a7100ru-command-injection-in-setgamespeedcfg)
- [Totolink A7100RU command injection in setFirewallType](https://junglewise.ai/threats/cve-2026-5691-totolink-a7100ru-command-injection-in-setfirewalltype)
- [Totolink A7100RU command injection in setNtpCfg](https://junglewise.ai/threats/cve-2026-5689-totolink-a7100ru-command-injection-in-setntpcfg)
- [Totolink A7100RU OS command injection in setDdnsCfg](https://junglewise.ai/threats/cve-2026-5688-totolink-a7100ru-os-command-injection-in-setddnscfg)
- [Totolink A7100RU OS command injection in cstecgi.cgi](https://junglewise.ai/threats/cve-2026-5678-totolink-a7100ru-os-command-injection-in-cstecgi-cgi)