CVE-2026-5679 Totolink CVE debrief

Who should care

Users of Totolink A3300R 17.0.0cu.557_B20221024 should assess their exposure and apply vendor remediation if available. Security teams and vulnerability management teams should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The vulnerability exists in the vsetTr069Cfg function of /cgi-bin/cstecgi.cgi in Totolink A3300R 17.0.0cu.557_B20221024. The stun_pass argument can be manipulated to inject OS commands. This issue allows attackers to execute arbitrary commands on the system, potentially leading to unauthorized access or data breaches. The CVSS score is 2, with a severity of LOW. This issue is currently tracked as Deferred in the NVD. Users of affected products should assess their exposure and apply vendor remediation if available, while also monitoring for exploitation attempts and performing inventory checks to identify affected systems.

Defensive priority

Apply vendor remediation if available. Monitor for exploitation attempts and perform inventory checks to identify affected systems.

Recommended defensive actions

• Apply vendor remediation if available
• Monitor for exploitation attempts
• Perform inventory checks to identify affected systems
• 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 was published on 2026-04-06T20:16:28.787Z and was last modified on 2026-07-24T09:10:00.153Z. The NVD entry is currently Deferred. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify the affected product deployments in their managed environments and review official advisories for validation.

Official resources