Description
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.
Published: 2026-04-23
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Command Execution
Action: Immediate Patch
AI Analysis

Impact

An issue in Totolink A3300R firmware allows attackers to execute arbitrary commands via the stunMinAlive parameter exposed in /cgi-bin/cstecgi.cgi. This flaw represents a command injection vulnerability (CWE‑78) that can lead to full control over the affected device, compromising confidentiality, integrity, and availability of the network it serves.

Affected Systems

The vulnerability affects Totolink routers running A3300R firmware version 17.0.0cu.557_B20221024. The affected CPEs indicate a hardware device and its associated firmware, so any units deployed with that build are susceptible.

Risk and Exploitability

The CVSS score of 9.8 marks it a critical vulnerability, while an EPSS score of less than 1% suggests a low probability of exploitation at the present time. The flaw is not listed in the CISA KEV catalog. The likely attack vector is network-based, requiring an attacker to send a specially crafted HTTP request to the device’s web interface; no authentication prerequisites are reported, so the attack could be performed against any device exposed to the network.

Generated by OpenCVE AI on April 28, 2026 at 07:49 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the device to the latest available firmware that contains the fix for the stunMinAlive command injection flaw.
  • Apply network segmentation or firewall rules to restrict access to the web administration interface and the /cgi-bin/cstecgi.cgi endpoint from untrusted networks.
  • Disable or block the STUN service on the router, if supported, to eliminate the vulnerable interface from exposure.

Generated by OpenCVE AI on April 28, 2026 at 07:49 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 28 Apr 2026 08:15:00 +0000

Type Values Removed Values Added
Title Command Injection via stunMinAlive Parameter in Totolink A3300R Firmware

Mon, 27 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Totolink
Totolink a3300r
Totolink a3300r Firmware
CPEs cpe:2.3:h:totolink:a3300r:-:*:*:*:*:*:*:*
cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:*
Vendors & Products Totolink
Totolink a3300r
Totolink a3300r Firmware

Thu, 23 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-78
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 23 Apr 2026 17:30:00 +0000

Type Values Removed Values Added
Description An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.
References

Subscriptions

Totolink A3300r A3300r Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-23T18:48:32.604Z

Reserved: 2026-03-09T00:00:00.000Z

Link: CVE-2026-31177

cve-icon Vulnrichment

Updated: 2026-04-23T18:46:52.853Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-23T18:16:24.997

Modified: 2026-04-27T14:59:11.160

Link: CVE-2026-31177

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-28T08:00:14Z

Weaknesses