CVE-2026-6156: OS Command Injection in Totolink A7100RU
CVE-2026-6156 is a critical OS command injection vulnerability in the Totolink A7100RU router firmware version 7. 4cu. 2313_b20191024. It affects the setIpQosRules function within the /cgi-bin/cstecgi. cgi CGI handler component. The vulnerability arises from improper handling of the 'Comment' argument, allowing remote attackers to execute arbitrary OS commands without authentication. Although the exploit has been publicly disclosed, there are no confirmed reports of exploitation in the wild. No official patch or remediation guidance has been provided by the vendor at this time.
AI Analysis
Technical Summary
This vulnerability in Totolink A7100RU firmware 7.4cu.2313_b20191024 involves an OS command injection via the 'Comment' parameter in the setIpQosRules function of the /cgi-bin/cstecgi.cgi CGI handler. An attacker can remotely send crafted input to this CGI endpoint, leading to execution of arbitrary operating system commands on the device. The CVSS 4.0 base score is 9.3, reflecting network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. The vulnerability is publicly disclosed but no official fix or mitigation has been documented.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary OS commands on the affected device, potentially leading to full compromise of the router. This can impact device confidentiality, integrity, and availability. Given the critical severity and remote exploitability, affected devices are at high risk if exposed to untrusted networks.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the device's management interface from untrusted networks to reduce exposure. Monitor for updates from Totolink regarding patches or mitigations.
CVE-2026-6156: OS Command Injection in Totolink A7100RU
Description
CVE-2026-6156 is a critical OS command injection vulnerability in the Totolink A7100RU router firmware version 7. 4cu. 2313_b20191024. It affects the setIpQosRules function within the /cgi-bin/cstecgi. cgi CGI handler component. The vulnerability arises from improper handling of the 'Comment' argument, allowing remote attackers to execute arbitrary OS commands without authentication. Although the exploit has been publicly disclosed, there are no confirmed reports of exploitation in the wild. No official patch or remediation guidance has been provided by the vendor at this time.
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 involves an OS command injection via the 'Comment' parameter in the setIpQosRules function of the /cgi-bin/cstecgi.cgi CGI handler. An attacker can remotely send crafted input to this CGI endpoint, leading to execution of arbitrary operating system commands on the device. The CVSS 4.0 base score is 9.3, reflecting network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. The vulnerability is publicly disclosed but no official fix or mitigation has been documented.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary OS commands on the affected device, potentially leading to full compromise of the router. This can impact device confidentiality, integrity, and availability. Given the critical severity and remote exploitability, affected devices are at high risk if exposed to untrusted networks.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the device's management interface from untrusted networks to reduce exposure. Monitor for updates from Totolink regarding patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-04-12T18:06:05.971Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dc6ab182d89c981fecb369
Added to database: 4/13/2026, 4:01:53 AM
Last enriched: 4/20/2026, 6:16:34 AM
Last updated: 5/29/2026, 1:50:21 AM
Views: 98
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.