CriticalPublic exploit

Command Injection in ToToLink A3300R /cgi-bin/cstecgi.cgi stunMaxAlive

IdentifiersCVE-2026-31178CWE-78· Improper Neutralization of Special…

CVE-2026-31178 is a command injection vulnerability in ToToLink A3300R firmware v17.0.0cu.557_B20221024. According to the provided content, the flaw is exposed through the /cgi-bin/cstecgi.cgi endpoint and is triggered via the stunMaxAlive parameter. Insufficient neutralization of attacker-controlled input allows arbitrary OS 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, and service disruption.

Mitigation

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

Restrict network access to the router management interface and the /cgi-bin/cstecgi.cgi endpoint to trusted administrative hosts only. Disable remote administration from untrusted networks, place management access behind VPN or ACL controls, and segment affected devices from direct Internet exposure. Continuously monitor for suspicious requests targeting the stunMaxAlive parameter and for signs of unauthorized command execution on affected devices until a patch is applied.

Remediation

Patch, then assume compromise.

Upgrade ToToLink A3300R firmware to a vendor-fixed version if one is available. If no patched release is currently available in the provided information, organizations should monitor the vendor for updated firmware addressing improper input handling in /cgi-bin/cstecgi.cgi, specifically the stunMaxAlive parameter, and apply the fix as soon as possible.

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-2026-31178 - 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 stunMaxAlive parameter in /cgi-bin/cstecgi.cgi.

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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 activity2