CVE-2026-9475: OS Command Injection in Totolink A8000RU
CVE-2026-9475 is a critical OS command injection vulnerability in the Totolink A8000RU router firmware version 7.1cu.643_b20200521. The flaw exists in the setIpQosRules function within the /cgi-bin/cstecgi.cgi Web Management Interface component. An attacker can remotely exploit this vulnerability by manipulating the Comment argument, leading to arbitrary OS command execution. The vulnerability has a high CVSS score of 9.3 and has been publicly disclosed, though no known exploits in the wild have been reported. No official patch or remediation guidance is currently available from the vendor.
AI Analysis
Technical Summary
This vulnerability affects the Totolink A8000RU router firmware 7.1cu.643_b20200521. It arises from improper input validation in the setIpQosRules function of the /cgi-bin/cstecgi.cgi web management interface, specifically through the Comment argument. This allows an unauthenticated remote attacker to inject and execute arbitrary OS commands on the device. The vulnerability is remotely exploitable without user interaction and has a critical severity rating with a CVSS 4.0 score of 9.3. Although publicly disclosed, there is no vendor advisory or patch available at this time.
Potential Impact
Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to execute arbitrary operating system commands on the affected device. This could lead to full compromise of the router, including unauthorized control, data manipulation, or disruption of network services. Given the critical CVSS score and remote, unauthenticated exploitability, the impact is severe.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting access to the device's web management interface to trusted networks only and monitor for unusual activity. No official vendor mitigation or temporary fix is currently documented.
CVE-2026-9475: OS Command Injection in Totolink A8000RU
Description
CVE-2026-9475 is a critical OS command injection vulnerability in the Totolink A8000RU router firmware version 7.1cu.643_b20200521. The flaw exists in the setIpQosRules function within the /cgi-bin/cstecgi.cgi Web Management Interface component. An attacker can remotely exploit this vulnerability by manipulating the Comment argument, leading to arbitrary OS command execution. The vulnerability has a high CVSS score of 9.3 and has been publicly disclosed, though no known exploits in the wild have been reported. No official patch or remediation guidance is currently available from the vendor.
CVSS v4.0
Score 9.3critical
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the Totolink A8000RU router firmware 7.1cu.643_b20200521. It arises from improper input validation in the setIpQosRules function of the /cgi-bin/cstecgi.cgi web management interface, specifically through the Comment argument. This allows an unauthenticated remote attacker to inject and execute arbitrary OS commands on the device. The vulnerability is remotely exploitable without user interaction and has a critical severity rating with a CVSS 4.0 score of 9.3. Although publicly disclosed, there is no vendor advisory or patch available at this time.
Potential Impact
Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to execute arbitrary operating system commands on the affected device. This could lead to full compromise of the router, including unauthorized control, data manipulation, or disruption of network services. Given the critical CVSS score and remote, unauthenticated exploitability, the impact is severe.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting access to the device's web management interface to trusted networks only and monitor for unusual activity. No official vendor mitigation or temporary fix is currently documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-05-24T09:15:21.440Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1485eca5ae1af1aacc71c3
Added to database: 05/25/2026, 17:25:00 UTC
Last enriched: 06/01/2026, 20:54:28 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 113
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