CVE-2026-6112 Totolink CVE debrief

Who should care

Defenders responsible for Totolink A7100RU devices, especially those with publicly accessible CGI handlers, should assess exposure and verify the effectiveness of current security controls.

Why it matters

CVE-2026-6112 is a high-severity vulnerability in Totolink A7100RU devices, allowing for os command injection via the CGI Handler. Defenders should prioritize verifying exposure and assessing security controls to prevent potential exploitation.

• Remote attackers can execute arbitrary commands on vulnerable devices
• Public exploit availability increases the risk of exploitation
• Successful exploitation can lead to unauthorized access and control

Technical summary

The setRadvdCfg function in /cgi-bin/cstecgi.cgi is vulnerable to os command injection via the maxRtrAdvInterval argument. This allows remote attackers to execute arbitrary commands on vulnerable devices. The vulnerability has a CVSS score of 8.9 and is considered high-severity. The affected product is Totolink A7100RU 7.4cu.2313_b20191024. Defenders should prioritize verifying exposure of Totolink A7100RU devices, especially those with publicly accessible CGI handlers, and assess the effectiveness of current security controls in preventing os command injection attacks.

Defensive priority

Defenders should prioritize verifying exposure of Totolink A7100RU devices, especially those with publicly accessible CGI handlers, and assess the effectiveness of current security controls in preventing os command injection attacks.

Recommended defensive actions

• Verify exposure of Totolink A7100RU devices with publicly accessible CGI handlers
• Assess the effectiveness of current security controls in preventing os command injection attacks
• Monitor for potential exploitation attempts targeting this vulnerability
• Apply vendor patches or updates to vulnerable devices
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.9 and the affected component. However, the vendor and affected versions are not clearly stated, requiring further verification.

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.