Totolink A8000RU Critical OS Command Injection (CVE-2026-7241)
The National Vulnerability Database has detailed CVE-2026-7241, a critical OS command injection vulnerability impacting Totolink A8000RU routers running firmware 7.1cu.643_b20200521. This flaw resides within the setWiFiBasicCfg function of the /cgi-bin/cstecgi.cgi component. Attackers can manipulate the wifiOff argument to execute arbitrary operating system commands.
The vulnerability carries a CVSSv3.1 score of 9.8 (Critical) due to its network-exploitable nature, low attack complexity, and lack of required privileges or user interaction. A remote attacker can achieve full compromise, leading to high impacts on confidentiality, integrity, and availability. The National Vulnerability Database confirms that public exploit code is available, significantly increasing the immediate threat level.
This is a severe issue for any organization or individual still using the affected Totolink A8000RU model. With public exploits circulating, these devices are prime targets for botnets, network pivots, or data exfiltration. Defenders must prioritize patching or isolating these devices immediately, as the window for unexploited systems is rapidly closing.
What This Means For You
- If your network includes Totolink A8000RU routers, specifically firmware 7.1cu.643_b20200521, you are exposed to a critical, remotely exploitable OS command injection (CVE-2026-7241) with public exploits. Identify these devices immediately, apply any available patches, or remove them from your network. Any such device should be treated as compromised until proven otherwise; audit logs for unusual activity.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7241 - Totolink A8000RU OS Command Injection via setWiFiBasicCfg
title: CVE-2026-7241 - Totolink A8000RU OS Command Injection via setWiFiBasicCfg
id: scw-2026-04-28-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-7241 by targeting the setWiFiBasicCfg function in Totolink A8000RU devices. The exploit involves manipulating the 'wifiOff' parameter in the /cgi-bin/cstecgi.cgi script to inject OS commands, such as 'ping' followed by a space, indicating a potential command injection attempt. This is a critical initial access vector.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7241/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/cgi-bin/cstecgi.cgi'
cs-uri-query|contains:
- 'setWiFiBasicCfg'
cs-uri-query|contains:
- 'wifiOff='
cs-uri-query|contains:
- 'ping'
cs-uri-query|contains:
- ' '
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7241 | Command Injection | Totolink A8000RU version 7.1cu.643_b20200521 |
| CVE-2026-7241 | Command Injection | Vulnerable component: CGI Handler |
| CVE-2026-7241 | Command Injection | Vulnerable file: /cgi-bin/cstecgi.cgi |
| CVE-2026-7241 | Command Injection | Vulnerable function: setWiFiBasicCfg |
| CVE-2026-7241 | Command Injection | Vulnerable argument: wifiOff |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 28, 2026 at 12:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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