Platform
linux
Component
totolink-a7100ru
Fixed in
7.4.1
CVE-2026-5688 describes a Command Injection vulnerability discovered in the Totolink A7100RU router. This flaw allows attackers to execute arbitrary operating system commands on the device, potentially leading to complete system takeover. The vulnerability affects routers running versions 7.4cu.2313b20191024–7.4cu.2313b20191024, and a fix is pending from the vendor.
The Command Injection vulnerability in the Totolink A7100RU router allows an attacker to inject and execute arbitrary OS commands. This can be exploited remotely by manipulating the 'provider' argument within the /cgi-bin/cstecgi.cgi file's setDdnsCfg function. Successful exploitation grants the attacker complete control over the router, enabling them to modify configurations, steal sensitive data (such as user credentials and network traffic), install malware, and potentially pivot to other devices on the network. The impact is significant, as a compromised router can serve as a launchpad for further attacks within the internal network, leading to data breaches and service disruptions. This vulnerability shares similarities with other command injection flaws where improper input validation allows attackers to execute arbitrary code.
CVE-2026-5688 has been publicly disclosed, indicating a higher probability of exploitation. The vulnerability is present in a widely deployed router model, increasing the potential attack surface. While no specific KEV listing or EPSS score is currently available, the public disclosure and ease of exploitation suggest a medium to high probability of exploitation. Public proof-of-concept exploits are likely to emerge, further increasing the risk. The vulnerability was published on 2026-04-06.
Exploit Status
EPSS
4.86% (90% percentile)
CISA SSVC
CVSS Vector
Due to the lack of a provided fixed version, immediate mitigation strategies are crucial. First, implement a Web Application Firewall (WAF) rule to filter requests containing suspicious characters or patterns in the 'provider' argument of the /cgi-bin/cstecgi.cgi endpoint. Alternatively, restrict access to this endpoint to trusted networks or IP addresses. Monitor router logs for unusual activity, specifically looking for command execution attempts. If possible, consider rolling back to a previous firmware version known to be secure, although this may introduce other vulnerabilities. Regularly review and update router configurations to minimize the attack surface. After implementing WAF rules or other mitigations, verify their effectiveness by attempting to trigger the vulnerability with a controlled payload.
Update the Totolink A7100RU router firmware to a patched version. Consult the official Totolink website for the latest firmware version and update instructions. This vulnerability allows os command injection, so applying the update is crucial to mitigate the risk.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2026-5688 is a Command Injection vulnerability affecting Totolink A7100RU routers, allowing attackers to execute OS commands remotely.
You are affected if your Totolink A7100RU router is running versions 7.4cu.2313b20191024–7.4cu.2313b20191024 and has not been updated.
A firmware update is required to fix this vulnerability. Until a fix is available, implement WAF rules or restrict access to the vulnerable endpoint.
The vulnerability has been publicly disclosed, increasing the likelihood of exploitation. Monitor your router for suspicious activity.
Refer to the Totolink website for official advisories and firmware updates related to CVE-2026-5688.
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.