CVE-2026-5677 Totolink CVE debrief

Who should care

Users and administrators of Totolink A7100RU 7.4cu.2313_b20191024 should assess the vulnerability and apply patches or mitigations as available. They should also review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The vulnerability exists in the CsteSystem function of /cgi-bin/cstecgi.cgi in Totolink A7100RU 7.4cu.2313_b20191024. An attacker can inject operating system commands by manipulating the resetFlags argument. This issue allows for remote exploitation, potentially leading to unauthorized command execution. Users and administrators should assess the vulnerability and apply patches or mitigations as available.

Defensive priority

Medium priority due to the CVSS score of 5.5 and the potential for remote exploitation.

Recommended defensive actions

• Apply patches or updates provided by the vendor as soon as available.
• Implement network access controls and firewalls to limit exposure.
• Monitor network traffic and system logs for suspicious activity.
• Consider compensating controls such as intrusion detection and prevention systems.
• Inventory and assess the vulnerability of affected systems.
• Review 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.

Evidence notes

The CVE record was published on 2026-04-06T19:16:30.680Z and was last modified on 2026-07-20T20:10:00.110Z. The NVD entry is currently Deferred. Evidence is limited, and defenders should verify the vulnerability's scope and impact. The attack may be initiated remotely, and the exploit has been released to the public.

Official resources