CriticalPublic exploit

Command Injection in TOTOLINK cstecgi.cgi pingCheck

IdentifiersCVE-2022-26187CWE-78

CVE-2022-26187 is a command injection vulnerability in TOTOLINK routers, including N600R firmware V4.3.0cu.7570_B20200620. The flaw is present in the cstecgi.cgi component, specifically via the pingCheck function. Insufficient neutralization of attacker-controlled input allows crafted data supplied to pingCheck to be interpreted by the underlying system shell, resulting in command execution on the device. Reporting associated with exploitation activity indicates the issue has been used as an initial access vector by the Rust-based RustoBot botnet to compromise exposed TOTOLINK devices and deploy follow-on payloads.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation enables remote code execution on the affected router. An attacker can execute arbitrary shell commands, download and run malware using utilities such as wget or tftp, conscript the device into a botnet, and use the compromised system for DDoS activity. Because the target is a network edge device, compromise can also provide a persistent foothold in the victim environment and facilitate further abuse of the router’s network position.

Mitigation

If you can’t patch tonight, do this now.

Restrict access to router management interfaces to trusted internal networks or a dedicated management network, and disable remote administration from the internet unless strictly required. Apply network ACLs/firewall rules to limit access to CGI endpoints. Monitor outbound traffic from routers for anomalous DNS-over-HTTPS, connections to untrusted domains, unexpected wget/tftp usage, and DDoS-like traffic patterns. Segment IoT and network infrastructure devices, enforce strong authentication on administrative access, and continuously inventory and audit exposed edge devices.

Remediation

Patch, then assume compromise.

Upgrade affected TOTOLINK devices to a vendor-fixed firmware version if available. Identify and patch all exposed affected models, including N600R and other reported vulnerable TOTOLINK devices using the same cstecgi.cgi code path. If no fixed firmware is available, replace unsupported devices. Review device administration settings and remove unnecessary internet exposure of management interfaces. Audit devices for signs of compromise, including unexpected downloader activity, suspicious outbound connections, unauthorized firmware-related actions, and botnet-related traffic.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

TotolinkN600r Firmwareoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app

the hacker newsNews

Apr 22, 2025

Docker Malware Exploits Teneo Web3 Node to Earn Crypto via Fake Heartbeat Signals

A security flaw in TOTOLINK devices that is being exploited by the RustoBot botnet to conduct DDoS attacks.

security online infoNews

Apr 22, 2025

RustoBot Botnet Exploits Router Flaws in Sophisticated Attacks

A command-injection vulnerability in TOTOLINK routers’ cstecgi.cgi (pingCheck) endpoint enabling remote code execution, leveraged to gain initial access and install the RustoBot botnet.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware1

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2022-26187

NVD

nvd.nist.gov/vuln/detail/CVE-2022-26187

MITRE CWE · CWE-78

cwe.mitre.org

Third Party Advisory

doudoudedi.github.io/2022/02/21/TOTOLINK-N600R-Command-Injection