CVE-2026-7823: OS Command Injection in Totolink A8000RU
CVE-2026-7823 is a critical OS command injection vulnerability in the Totolink A8000RU router firmware version 7. 1cu. 643_b20200521. The flaw exists in the setAppFilterCfg function within /cgi-bin/cstecgi. cgi, where manipulation of the 'enable' argument allows remote attackers to execute arbitrary OS commands. The vulnerability has a high CVSS 4. 0 score of 9. 3, indicating it is exploitable over the network without authentication or user interaction. Although a public exploit is available, there is no confirmed patch or official remediation at this time.
AI Analysis
Technical Summary
This vulnerability in Totolink A8000RU firmware 7.1cu.643_b20200521 allows remote attackers to perform OS command injection via the 'enable' parameter in the setAppFilterCfg function of /cgi-bin/cstecgi.cgi. The flaw enables execution of arbitrary commands on the device, potentially compromising the router. The CVSS 4.0 vector indicates network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation can lead to full compromise of the affected router, allowing attackers to execute arbitrary operating system commands remotely. This can result in unauthorized control, data leakage, or disruption of network services. The vulnerability is critical due to its ease of exploitation and high impact on device security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, affected users should consider disabling remote management features or restricting access to the device's management interface to trusted networks only. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-7823: OS Command Injection in Totolink A8000RU
Description
CVE-2026-7823 is a critical OS command injection vulnerability in the Totolink A8000RU router firmware version 7. 1cu. 643_b20200521. The flaw exists in the setAppFilterCfg function within /cgi-bin/cstecgi. cgi, where manipulation of the 'enable' argument allows remote attackers to execute arbitrary OS commands. The vulnerability has a high CVSS 4. 0 score of 9. 3, indicating it is exploitable over the network without authentication or user interaction. Although a public exploit is available, there is no confirmed patch or official remediation at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Totolink A8000RU firmware 7.1cu.643_b20200521 allows remote attackers to perform OS command injection via the 'enable' parameter in the setAppFilterCfg function of /cgi-bin/cstecgi.cgi. The flaw enables execution of arbitrary commands on the device, potentially compromising the router. The CVSS 4.0 vector indicates network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation can lead to full compromise of the affected router, allowing attackers to execute arbitrary operating system commands remotely. This can result in unauthorized control, data leakage, or disruption of network services. The vulnerability is critical due to its ease of exploitation and high impact on device security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, affected users should consider disabling remote management features or restricting access to the device's 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
- 2026-05-04T22:14:08.282Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f97ad1cbff5d8610ab99f1
Added to database: 5/5/2026, 5:06:25 AM
Last enriched: 5/5/2026, 5:21:19 AM
Last updated: 5/5/2026, 6:07:32 AM
Views: 3
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