CVE-2026-7244: Critical Command Injection Flaw in Totolink Router
The National Vulnerability Database has disclosed a critical command injection vulnerability, CVE-2026-7244, impacting Totolink A8000RU routers running firmware version 7.1cu.643_b20200521. The flaw resides in the setWiFiEasyGuestCfg function within the /cgi-bin/cstecgi.cgi component. Attackers can exploit this by manipulating a specific argument, leading to remote code execution on the device. This vulnerability carries a CVSS score of 9.8, classifying it as critical.
Given the public availability of exploit code and the critical nature of this flaw, organizations utilizing Totolink A8000RU devices should consider this a high-priority threat. The ability to remotely inject commands into a network device opens the door for significant compromise, including data exfiltration, further network pivoting, or turning the router into a malicious node. The National Vulnerability Database highlights CWE-77 and CWE-78, both related to command injection, as the underlying issues.
Defenders need to immediately identify all deployed Totolink A8000RU routers and check their firmware versions. Patching or replacing vulnerable devices is paramount. Where patching is not immediately feasible, network segmentation and strict access controls around these devices should be implemented to limit exposure. Network monitoring for unusual outbound traffic or unexpected command execution patterns originating from these devices is also advised.
What This Means For You
- If your organization uses Totolink A8000RU routers, you must verify the firmware version and patch immediately against CVE-2026-7244. Given the critical CVSS score and publicly available exploit, assume exploitation is imminent or already occurring. Audit network logs for any signs of unauthorized command execution on these devices.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 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-2026-7244: Totolink Router CGI Handler Command Injection
title: CVE-2026-7244: Totolink Router CGI Handler Command Injection
id: scw-2026-04-28-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-7244 by targeting the setWiFiEasyGuestCfg function within the cstecgi.cgi CGI handler on Totolink routers. The rule looks for specific URI paths and query parameters indicative of command injection attempts, including the presence of 'merge' and common command injection characters like backticks, semicolons, pipes, or dollar signs.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7244/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/cgi-bin/cstecgi.cgi'
cs-uri-query|contains:
- 'setWiFiEasyGuestCfg'
cs-uri-query|contains:
- 'merge'
cs-uri-query|contains:
- '`'
cs-uri-query|contains:
- ';'
cs-uri-query|contains:
- '|'
cs-uri-query|contains:
- '$'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7244 | Command Injection | Totolink A8000RU 7.1cu.643_b20200521 |
| CVE-2026-7244 | Command Injection | Vulnerable component: CGI Handler |
| CVE-2026-7244 | Command Injection | Vulnerable file: /cgi-bin/cstecgi.cgi |
| CVE-2026-7244 | Command Injection | Vulnerable function: setWiFiEasyGuestCfg |
| CVE-2026-7244 | Command Injection | Vulnerable argument: merge |
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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