CVE-2026-6155 Totolink CVE debrief

Who should care

System administrators and security teams responsible for Totolink A7100RU 7.4cu.2313 devices, especially those exposed to the internet, should assess their exposure and prioritize patching or mitigation.

Why it matters

CVE-2026-6155 is a high-severity vulnerability in Totolink A7100RU 7.4cu.2313 that allows remote OS command injection. System administrators and security teams should prioritize patching or mitigation to prevent potential system compromise and data breaches.

• Remote attackers can inject OS commands, potentially leading to system compromise
• Public exploit availability increases the risk of attacks
• Successful exploitation could result in arbitrary code execution or data breaches

Technical summary

The vulnerability exists in the setWanCfg function of the /cgi-bin/cstecgi.cgi file in Totolink A7100RU 7.4cu.2313. An attacker can inject OS commands by manipulating the pppoeServiceName argument. The attack can be launched remotely, and a public exploit is available. The vulnerability allows remote attackers to inject OS commands, potentially leading to system compromise and data breaches. Successful exploitation could result in arbitrary code execution or data breaches. System administrators and security teams should prioritize patching or mitigation to prevent potential system compromise and data breaches.

Defensive priority

High priority for remote systems using Totolink A7100RU 7.4cu.2313, especially those exposed to the internet.

Recommended defensive actions

• Verify and apply vendor patches or updates for Totolink A7100RU 7.4cu.2313
• Restrict access to the /cgi-bin/cstecgi.cgi interface
• Monitor for suspicious activity related to the setWanCfg function
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability. Additional details are available from various source references, including Vuldb submissions and GitHub repository. The information available indicates that the vulnerability exists in the setWanCfg function of the /cgi-bin/cstecgi.cgi file in Totolink A7100RU 7.4cu.2313. However, the exact scope of affected systems and potential impact is limited by the information provided in the CVE record and NVD detail page. Defenders should verify the affected scope and

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.