CVE-2026-6139: OS Command Injection in Totolink A7100RU
A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function UploadOpenVpnCert of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument FileName leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
AI Analysis
Technical Summary
This vulnerability in Totolink A7100RU firmware 7.4cu.2313_b20191024 allows remote attackers to perform OS command injection via the UploadOpenVpnCert function in the /cgi-bin/cstecgi.cgi CGI handler. The issue arises from improper sanitization of the FileName parameter, enabling arbitrary command execution on the device. The CVSS 4.0 base score is 9.3, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. The vulnerability is publicly known and exploitable remotely, but no vendor patch or official fix has been documented.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary operating system commands on the affected device without authentication. This can lead to full compromise of the device, including control over its configuration and network traffic. The vulnerability impacts confidentiality, integrity, and availability of the device and potentially the network it serves.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, affected users should consider disabling the vulnerable functionality if possible or isolating the device from untrusted networks to reduce exposure. Monitor vendor channels for updates and apply patches promptly once released.
CVE-2026-6139: OS Command Injection in Totolink A7100RU
Description
A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function UploadOpenVpnCert of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument FileName leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
CVSS v4.0
Score 9.3critical
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Totolink A7100RU firmware 7.4cu.2313_b20191024 allows remote attackers to perform OS command injection via the UploadOpenVpnCert function in the /cgi-bin/cstecgi.cgi CGI handler. The issue arises from improper sanitization of the FileName parameter, enabling arbitrary command execution on the device. The CVSS 4.0 base score is 9.3, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. The vulnerability is publicly known and exploitable remotely, but no vendor patch or official fix has been documented.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary operating system commands on the affected device without authentication. This can lead to full compromise of the device, including control over its configuration and network traffic. The vulnerability impacts confidentiality, integrity, and availability of the device and potentially the network it serves.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, affected users should consider disabling the vulnerable functionality if possible or isolating the device from untrusted networks to reduce exposure. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-04-12T07:27:28.685Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dc440382d89c981fa0abf7
Added to database: 4/13/2026, 1:16:51 AM
Last enriched: 4/20/2026, 6:01:25 AM
Last updated: 5/29/2026, 12:39:00 AM
Views: 99
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.