CVE-2026-9404: OS Command Injection in Totolink A8000RU
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.
AI Analysis
Technical Summary
The Totolink A8000RU router firmware 7.1cu.643_b20200521 contains an OS command injection vulnerability (CVE-2026-9404) in the setDdnsCfg function of the /cgi-bin/cstecgi.cgi web management interface. This vulnerability allows remote attackers to inject and execute arbitrary operating system commands by manipulating the 'provider' parameter. The vulnerability is remotely exploitable without authentication, has a CVSS 4.0 score of 9.3, and is classified as critical. Public exploit code exists, but no vendor patch or official remediation has been disclosed as of the publication date.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary OS commands on the affected device, potentially leading to full system compromise. This can result in unauthorized control over the router, disruption of network services, and further attacks on connected networks or devices. The critical CVSS score reflects the high likelihood and impact of exploitation.
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 disabling remote management features if possible or restrict access to the web management interface to trusted networks only. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-9404: OS Command Injection in Totolink A8000RU
Description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.
CVSS v4.0
Score 9.3critical
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Totolink A8000RU router firmware 7.1cu.643_b20200521 contains an OS command injection vulnerability (CVE-2026-9404) in the setDdnsCfg function of the /cgi-bin/cstecgi.cgi web management interface. This vulnerability allows remote attackers to inject and execute arbitrary operating system commands by manipulating the 'provider' parameter. The vulnerability is remotely exploitable without authentication, has a CVSS 4.0 score of 9.3, and is classified as critical. Public exploit code exists, but no vendor patch or official remediation has been disclosed as of the publication date.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary OS commands on the affected device, potentially leading to full system compromise. This can result in unauthorized control over the router, disruption of network services, and further attacks on connected networks or devices. The critical CVSS score reflects the high likelihood and impact of exploitation.
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 disabling remote management features if possible or restrict access to the web management interface to trusted networks only. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-05-24T06:27:20.408Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1388cea5ae1af1aaf875f8
Added to database: 05/24/2026, 23:25:02 UTC
Last enriched: 06/01/2026, 20:14:55 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 138
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