CriticalPublic exploit

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

IdentifiersCVE-2026-31175CWE-77· Improper Neutralization of Special…

CVE-2026-31175 is a command injection vulnerability in ToToLink A3300R firmware v17.0.0cu.557_B20221024. According to the provided content, the flaw exists in handling of the stunEnable parameter by the /cgi-bin/cstecgi.cgi endpoint, allowing attacker-supplied input to be interpreted as operating system commands. Successful exploitation enables arbitrary command execution on the affected device.

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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 allows remote arbitrary command execution on the vulnerable router. The provided CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) indicates no privileges or user interaction are required and that exploitation can result in high impact to confidentiality, integrity, and availability, including full compromise of the device, modification of configuration or system state, disclosure of sensitive information, and service disruption.

Mitigation

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

Restrict network access to the router management interface and specifically to /cgi-bin/cstecgi.cgi from untrusted networks. Disable remote administration if not required, place the management plane behind trusted internal networks or ACLs, and limit exposure via firewall rules. Monitor for suspicious requests targeting the stunEnable parameter and for signs of unauthorized command execution on affected devices until patched firmware can be deployed.

Remediation

Patch, then assume compromise.

Upgrade from the affected ToToLink A3300R firmware version v17.0.0cu.557_B20221024 to a vendor-fixed release if one is available. If a patched firmware version has not yet been published, monitor vendor advisories and apply the fix as soon as it is released. Because the issue is in command handling for /cgi-bin/cstecgi.cgi, remediation requires vendor correction of input handling for the stunEnable parameter to prevent command injection.

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

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

2 SOURCESView more in app

cvefeed high severityNews

Apr 23, 2026

CVE-2026-31175 - ToToLink A3300R Command Injection Vulnerability

A command injection vulnerability in ToToLink A3300R firmware v17.0.0cu.557_B20221024 via the stunEnable parameter of /cgi-bin/cstecgi.cgi, allowing arbitrary command execution.

What this page doesn’t show

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Exposure mapping

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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 activity1