CriticalPublic exploit

Command Injection in ToToLink A3300R /cgi-bin/cstecgi.cgi stunMinAlive Parameter

IdentifiersCVE-2026-31177CWE-78· Improper Neutralization of Special…

CVE-2026-31177 is a command injection vulnerability in ToToLink A3300R firmware v17.0.0cu.557_B20221024. According to the provided content, the flaw exists in requests handled by /cgi-bin/cstecgi.cgi, where the stunMinAlive parameter can be abused to execute arbitrary operating system commands. The issue is classified as CWE-78, indicating improper neutralization of special elements used in an OS command. The available information indicates the vulnerable condition is reachable remotely over the network and does not require prior authentication or user interaction.

For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

Start free trial

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 allows remote arbitrary command execution on the affected device. Based on the provided CVSS v3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, the impact is high across confidentiality, integrity, and availability. An attacker could run commands in the device context, access or exfiltrate sensitive information, alter system configuration or firmware behavior, and disrupt device operation or service availability.

Mitigation

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

Until a fixed firmware release is available, restrict network access to the device management interface and specifically to /cgi-bin/cstecgi.cgi to trusted administrative hosts only. Do not expose the router administration interface to the Internet. Place management access behind firewall rules, ACLs, or a VPN; disable remote administration if not required; and segment affected devices from untrusted networks. Monitor HTTP requests to the CGI endpoint for suspicious values in the stunMinAlive parameter and review device logs and configuration for signs of unauthorized command execution.

Remediation

Patch, then assume compromise.

Upgrade from the affected ToToLink A3300R firmware v17.0.0cu.557_B20221024 to a vendor-fixed release if one is available. If a patched firmware version has not been published, monitor vendor advisories and apply the first release that specifically addresses CVE-2026-31177 or the command injection issue in /cgi-bin/cstecgi.cgi. Because the vulnerable parameter is processed by the device web interface/CGI component, remediation should prioritize eliminating command construction from untrusted input and implementing strict server-side input validation and sanitization for stunMinAlive.

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

TotolinkA3300r Firmwareoperating_system

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

ACTIVITY FEED

Recent activity

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

3 SOURCESView more in app

cvefeed high severityNews

Apr 23, 2026

CVE-2026-31177 - ToToLink A3300R Command Injection Vulnerability

A command injection vulnerability in ToToLink A3300R firmware v17.0.0cu.557_B20221024 that allows arbitrary command execution via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.

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.

Start free trial

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 malware

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